Unable to import QTI quizzes (after installing the QTI import tool)

[JedMeister]

A user has reported that after installing the QTI import tool - importing QTI quizzes fails with a (particularly unhelpful) message of:

There was an unexpected error, please contact support

I has not be confirmed, but this issue seems to be related to #1979

They also reported that emails were not sending.

In the case of the QTI import, the user reported that when applying the "fix" noted in #1979, he got the output:

NOTE: Migration 20101216224513_create_delayed_jobs.rb from switchman_inst_jobs has been skipped. Migration with the same name already exists.

The user then noted that after applying the bundle command, despite the message that the migration had been skipped, the behavior appeared to change:

Now the expand zip upload and QTI is back to being broken totally just hangs and emails still not going through.

[courtesysoft]

This can happen when you haven't installed the python3-lxml dependency:
apt-get install python3-lxml

see:
https://github.com/instructure/QTIMigrationTool/wiki

In the ruby file ( /var/canvas/lib/cc/importer/canvas/quiz_converter.rb:54 ), the erroring line is in a place where it's trying to open a file. That was confusing to me, i thought it was a file permissions issue initially. Actually it was a failure to launch python.