MacOS Monterey library issue

Dear,
I have successfully used the driver before on macOS Big Sur, but now after upgrading the system (fresh install) the driver stopped working. My code is written in python but I have also tested the MacCAN Monitor, both without success.

Further details:
CPU: Intel
macOS: 12.2.1
hardware: PCAN-USB adapter

python output: "The driver is not loaded"
MacCAN Monitor output: "Something went terribly wrong! Error 0200: The driver is not loaded"

I tried the universal_64 and Intel_x86_64 0.10.1 and 0.11 version. The result is always the same.

[mac-can]

I´ve created a troubleshooting guide for analyzing issues on Monterey and/or M1 chip as a Gist: https://gist.github.com/mac-can/a43f08e530714dd74689762f62f88dca

@daniInfi7 Could you pl. check this step by step and send me your results. Thx. Uwe

See also issue #4

As you have suggested I have checked the issue #4 and the solution was to use the binary macOS_Library_for_PCANUSB_v0.10.1.tar.gz from https://www.uv-software.de/dokuwiki/doku.php?id=uvs:programs:pcbusb_library

is there any difference with this binary and the one that is included in the Library folder inside MacCAN_Monitor.0.4_x86.1.dmg?

[mac-can]

As stated in my comment of 11/10/21, the x86_64 version is compiled to run on old OS X versions (tested with 10.13).
Maybe this is denied by Monterey. No further differences.

@daniInfi7 What´s about PCBUSB-Library version 0.11 (universal binary) is it running on you Mac now?

@mac-can I have now tested different scenarios and the 0.11 (universal binary) as also 0.10.1 (included in the .dmg) work only with the c++ example and test/monitor example, with mac-can app and python they don't.

macOS_Library_for_PCANUSB_v0.10.1.tar.gz works with everything.

[mac-can]

Issue reopened because it is not solved for v0.11 of the library on Monterey.

I was able to reproduce the error on a system with Monterey (12.1):

• The C++ examples, which load the library at compile time, work fine.
• The Python example, which loads the library at runtime, throws the error code 512 ("The driver is not loaded").
• The MacCAN Monitor App does the same.

Further investigations required.

[kedvall]

Hi @mac-can @daniInfi7. I'm currently experiencing the exact same issue. Any updates?

• I'm on Monterey 12.3
• I'm trying to use the v0.11 universal binary release on Python 3.9
• I can't use anything that loads the library at runtime, also throws the 512 (driver is not loaded) error
  I would be happy to help debugging but I'm not really sure where to start

[mac-can]

Hi @mac-can @daniInfi7. I'm currently experiencing the exact same issue. Any updates?

• I'm on Monterey 12.3
• I'm trying to use the v0.11 universal binary release on Python 3.9
• I can't use anything that loads the library at runtime, also throws the 512 (driver is not loaded) error
  I would be happy to help debugging but I'm not really sure where to start

Hi @kedvall,
Occasionally, I get this crash report when I try to connect to a PCAN interface in the MacCAN Monitor App while using PCBUSB-Library version 0.11 on macOS Monterey (arm64). (I have never seen this behavior on Big Sur (x86_64) nor on High Sierra.)
I can't figure it out, but maybe it's a starting point for root causing or debugging.

[herrspade]

Hi, I have the same problem.

• Monterey 12.3.1 (21E258)
• Intel Core i7
• Python 3.10.2 (pyenv)
• can_moni works
• building and running pcbusb_recv and pcbusb_send examples work
• Everything python seems to fail with status 0x200 'The driver is not loaded'

Anything I can do to assist finding/fixing the problem?

[Dan-Kouba]

I am seeing the same "The driver is not loaded" issue on my machine:

• Monterrey 12.2.1
• Intel Core i9
• Python 3.8
• Library v0.11 (also tried 0.10.1 and 0.8 with the same failures)
• Both python-can v4.0.0 and MacCAN fail with the same error

[mac-can]

Preliminary version that should solve the issue: macOS_Library_for_PCANUSB_v0.11.1.pre.tar.gz

[herrspade]

Great work, tested it and It works from me!

[Dan-Kouba]

This works for me as well, thank you!