[scwehrl]

isinstance() arg 2 must be a class, type, or tuple of classes and types
Detailed traceback:
Traceback (most recent call last):
File "calibre\gui2\__init__.pyo", line 144, in dispatch
File "main.py", line 988, in scheduled_recipe_fetched
File "main.py", line 1335, in job_exception
File "C:\Program Files\calibre\library.zip\calibre\parallel.py", line 618, in gui_text
TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types

Above is 0.4.124 on 32-bit Vista