how to debug weasyprint error - failed to load a library: cairo / cairo-2

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Michael Beller

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Jun 14, 2016, 6:57:34 PM6/14/16

to web2py-users

I posted this on the pythonanywhere (PAW) forums also but I think it may be web2py specific (or at least specific to the PAW/web2py combination) ...

I'm using weasyprint to generate a PDF. It's working on my local dev environment and my PAW personal account.

On a new PAW account it fails on:

from weasyprint import HTML, CSS

with the error:

OSError: dlopen() failed to load a library: cairo / cairo-2

On the new PAW account, the import works in a python console (just not from within the web2py app).

As far as I can tell, the original and new PAW accounts are identical. I also recently create a new virtualenv on the new account to try and isolate the library/package that may be out of sync but I'm getting the same error.

Any ideas how to debug?

Michael Beller

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Jun 15, 2016, 5:30:49 PM6/15/16

to web2py-users

Just for the record ... I solved this by deleting the virtualenv and all user installed libraries (using 'pip uninstall ...'). Then simply reinstalling 'pip install --user weasyprint==0.27'

I never found the root cause of the problem. Here is the conversation on PAW with some more info if anybody in the future needs it ...