Could not load the Exodriver driver error

What are the permissions of your /usr/local/lib directory? The file permissions look fine, but directory permissions can cause issues as well. Look at our response on this forum topic as it discusses what to check and what command to run if you need to correct directory permissions:

https://labjack.com/forums/u3/new-user-need-help-getting-started

I am having the same problem. My permissions are the same. 

<class 'LabJackPython.LabJackException'>: Could not load the Exodriver driver. Ethernet connectivity only.

Check that the Exodriver is installed, and the permissions are set correctly.

The error message was: dlopen(liblabjackusb.dylib, 6): image not found

Traceback (most recent call last):

  File "test.py", line 11, in <module>

    devices = u3.openAllU3()

  File "/Library/Python/2.7/site-packages/u3.py", line 51, in openAllU3

    for i in range(deviceCount(3)):

  File "/Library/Python/2.7/site-packages/LabJackPython.py", line 1233, in deviceCount

    return staticLib.LJUSB_GetDevCount(devType)

AttributeError: 'NoneType' object has no attribute 'LJUSB_GetDevCount'

In a terminal run:

ls -l /usr/local

And double check that the lib directory has correct permissions as well. If that doesn't help resolve the issue, what version of  Mac OS X / macOS are you running?

This is what I get.

Alexs-MBP:~ alexchiem$ ls -l /usr/local

total 8

drwxrwxr-x    3 alexchiem  admin   102 May 22 14:27 Cellar

drwxrwxr-x    2 alexchiem  admin    68 May 22 14:26 Frameworks

drwxrwxr-x   17 alexchiem  admin   578 May 22 14:26 Homebrew

drwxr-xr-x    4 alexchiem  admin   136 Nov 18  2015 apache-maven

drwxrwxr-x   81 alexchiem  admin  2754 May 22 14:26 bin

drwxr-xr-x    4 alexchiem  admin   136 Dec 10 14:24 etc

drwxr-xr-x   20 alexchiem  admin   680 Dec  2  2015 go

drwxrwxr-x   27 alexchiem  admin   918 May 24 17:42 include

drwxrwxr-x  106 alexchiem  admin  3604 May 24 17:50 lib

drwxr-xr-x    4 alexchiem  admin   136 Jan  7  2015 man

lrwxr-xr-x    1 alexchiem  admin    26 Nov 19  2015 mysql -> mysql-5.7.9-osx10.9-x86_64

drwxr-xr-x   13 alexchiem  admin   442 Nov 19  2015 mysql-5.7.9-osx10.9-x86_64

drwxrwxr-x    3 alexchiem  admin   102 May 22 14:27 opt

drwxrwxr-x    2 alexchiem  admin    68 May 22 14:26 sbin

drwxrwxr-x   11 alexchiem  admin   374 May 22 14:27 share

drwxrwxr-x    3 alexchiem  admin   102 May 22 14:26 var

I am running OS X El Capitan 10.11.2.

Try the latest LabJackPython on GitHub and see if it helps:

https://github.com/labjack/LabJackPython

I updated it to attempt to load the Exodriver with full path if the normal load fails. We have ran into cases with other customers having issues sometimes where the default library paths on the system does not include /usr/local/lib, and this was one solution for it without having to do additional installs or modifying a system setting.

If the latest LabJackPython doesn't resolve the issue, did you install Exodriver with our installer or did you build it from source code? If by source code, 64-bit Python needs a 64-bit Exodriver build and 32-bit Python needs a 32-bit Exodriver build. Otherwise our Exodriver installer installs both a 32-bit and 64-bit Exodriver.

Hi,

I installed it through the the Exodriver installer not source code. 

Thank you

When I just import u3 from the python shell, this is what I get.

>>> import u3

<class 'LabJackPython.LabJackException'>: Could not load the Exodriver driver. Ethernet connectivity only.

Check that the Exodriver is installed, and the permissions are set correctly.

The error message was: dlopen(/usr/local/lib/liblabjackusb.dylib, 6): image not found

Hi, 

After reinstalling everything, I got it to run but it only runs once then I get an error. I have to unplug it and plug it in again for it to run again.

Alexs-MBP:prog_vr_sw alexchiem$ python prog_vr.py 

Setting initial values for VOUT domains...

Setting r_sense...

SW value: 3921.56862745, HW value: 1000000

Setting r_shunt...

SW value: 1000.0, HW value: 2500

Setting r_set...

SW value: 9960.78431373, HW value: 20000

Voltage VOUT0: (-0.000125, 'volts')

-0.000125

Current VOUT0: (-0.00015937499999999998, 'amps')

Alexs-MBP:prog_vr_sw alexchiem$ python prog_vr.py 

Traceback (most recent call last):

  File "prog_vr.py", line 689, in <module>

    i2c_addr=I2C_MUX_ADDR

  File "prog_vr.py", line 63, in __init__

    devices = u3.openAllU3()

  File "build/bdist.macosx-10.11-intel/egg/u3.py", line 56, in openAllU3

  File "build/bdist.macosx-10.11-intel/egg/u3.py", line 102, in __init__

    """

  File "build/bdist.macosx-10.11-intel/egg/u3.py", line 137, in open

    """

  File "build/bdist.macosx-10.11-intel/egg/LabJackPython.py", line 602, in open

    return False

  File "build/bdist.macosx-10.11-intel/egg/LabJackPython.py", line 1367, in openLabJack

    try:

  File "build/bdist.macosx-10.11-intel/egg/LabJackPython.py", line 1446, in _makeDeviceFromHandle

    elif firstFound:

IndexError: list index out of range

Before exiting your application make sure to close the device so the USB handle is freed. Mac OS X doesn't automatically free USB handles when an application closes. If you do not close the handle, the device is still claimed by the system and you can't close it programmatically in different/new process. A power cycle is needed in this case.

I was experiencing a similar error, where despite installing everything using the proper installers any time I tried to run "import u3" it would give me the below error:

>>> import u3

<class 'LabJackPython.LabJackException'>: Could not load the Exodriver driver. Ethernet connectivity only.

Check that the Exodriver is installed, and the permissions are set correctly.

The error message was: dlopen(liblabjackusb.dylib, 6): image not found

I decided that since I installed the LabJackPython package with pip I would try downloading from GitHub and see if things changed. Initially it gave me the same error, but I entered it again just to make sure and it works. Now the import function doesn't give error warnings the second time I call it every time, but there are obviously still problems since the U3 constructor still gives me errors:

>>> import u3

<class 'LabJackPython.LabJackException'>: Could not load the Exodriver driver. Ethernet connectivity only.

Check that the Exodriver is installed, and the permissions are set correctly.

The error message was: dlopen(liblabjackusb.dylib, 6): image not found

>>> import u3

>>> d = u3.U3()

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/local/lib/python2.7/site-packages/u3.py", line 98, in __init__

    self.open(**kargs)

  File "/usr/local/lib/python2.7/site-packages/u3.py", line 133, in open

    Device.open(self, 3, firstFound = firstFound, serial = serial, localId = localId, devNumber = devNumber, handleOnly = handleOnly, LJSocket = LJSocket )

  File "/usr/local/lib/python2.7/site-packages/LabJackPython.py", line 639, in open

    d = openLabJack(devType, ct, firstFound = True, handleOnly = handleOnly, LJSocket = LJSocket)

  File "/usr/local/lib/python2.7/site-packages/LabJackPython.py", line 1469, in openLabJack

    handle = _openLabJackUsingExodriver(deviceType, firstFound, pAddress, devNumber)

  File "/usr/local/lib/python2.7/site-packages/LabJackPython.py", line 1330, in _openLabJackUsingExodriver

    openDev = staticLib.LJUSB_OpenDevice

AttributeError: 'NoneType' object has no attribute 'LJUSB_OpenDevice'

As you can see, it's pretty bizarre. Just for reference, here are all the things you asked the above people for:

- I installed Exodriver from the MacOSX installer, although originally I installed from the source (maybe this is the route of the problem?).

- All of the C examples in the source code function properly and give output.

- library permissions

ls -l /usr/local

total 0

drwxrwxr-x   40 samanthajensen  admin  1360 Jul 31 14:18 Cellar

drwxrwxr-x    3 samanthajensen  admin   102 Jul  5 11:07 Frameworks

drwxrwxr-x   17 samanthajensen  admin   578 Jul 31 14:15 Homebrew

drwxrwxr-x  181 samanthajensen  admin  6154 Jul 31 14:18 bin

drwxrwxr-x    6 samanthajensen  admin   204 Jul  5 11:08 etc

drwxrwxr-x   80 samanthajensen  admin  2720 Aug  4 14:50 include

drwxrwxr-x  165 samanthajensen  admin  5610 Aug  4 14:50 lib

drwxr-xr-x    5 root            wheel   170 Mar 29  2013 man

drwxrwxr-x   51 samanthajensen  admin  1734 Jul 31 14:18 opt

drwxr-xr-x    3 root            wheel   102 Jun 12 17:38 remotedesktop

drwxrwxr-x    2 samanthajensen  admin    68 Jun 30 14:42 sbin

drwxrwxr-x   38 samanthajensen  admin  1292 Aug  3 15:06 share

drwxrwxr-x    4 samanthajensen  admin   136 Jul  5 11:06 var

-python versions

file /usr/bin/python

/usr/bin/python: Mach-O universal binary with 2 architectures: [x86_64: Mach-O 64-bit executable x86_64] [i386: Mach-O executable i386]

/usr/bin/python (for architecture x86_64): Mach-O 64-bit executable x86_64

/usr/bin/python (for architecture i386): Mach-O executable i386

- liblabjackusb.dylib versions

file /usr/local/lib/liblabjackusb.dylib 

/usr/local/lib/liblabjackusb.dylib: Mach-O universal binary with 3 architectures: [i386: Mach-O dynamically linked shared library i386] [x86_64: Mach-O 64-bit dynamically linked shared library x86_64] [ppc: Mach-O dynamically linked shared library ppc]

/usr/local/lib/liblabjackusb.dylib (for architecture i386): Mach-O dynamically linked shared library i386

/usr/local/lib/liblabjackusb.dylib (for architecture x86_64): Mach-O 64-bit dynamically linked shared library x86_64/usr/local/lib/liblabjackusb.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc

It looks like there is still an issue with finding the Exodriver library (liblabjackusb.lib) on your system. If permissions is not an issue (yours look fine), the current development version on GitHub has a Mac fix to force the library load to search in /usr/local/lib. Judging from this error:

dlopen(liblabjackusb.dylib, 6): image not found

The version you installed from pip or from our LabJackPython page is still being used, and not the GitHub version. In the newer version that error would instead mention "dlopen(/usr/local/lib/liblabjackusb.dylib, 6)" if the library could not be found.

With "pip uninstall", uninstall LabJackPython as there might be a conflict by using two different installation methods. Then reinstall the GitHub version and see if that helps. If not, go into your Python's site-packages directory and manually delete the following files:

Modbus.py / .pyc
skymote.py / .pyc
u3.py / .pyc
u6.py / .pyc
u12.py / .pyc
ue9.py / .pyc
LabJackPython-<VERSION-DATA>.egg-info

And then reinstall with the GitHub Version. When installing "python setup.py install", it will tell you where the site-packages directory is.

Thanks for your prompt answer! It was indeed still using the pip version.