Exception: "'dict' object has no attribute 'set'"

[samsapti]

Bug description

The bug occurs on running kat startup after entering something in step 2. This happens no matter what I type (tried with blank, "python" and "java").

Traceback (most recent call last):
  File "/usr/bin/kat", line 40, in main
    execCommand[command](data)
  File "/path/to/Kat/commands/startup.py", line 44, in startupCommand
    result = v['fn']()
  File "/path/to/Kat/commands/startup.py", line 30, in languageStep
    cfg.set("kat", "language", language if language.lower() in allLangs else lang)
AttributeError: 'dict' object has no attribute 'set'

Error occurred:
 'dict' object has no attribute 'set'

Also, when running kat test <problem>, I get this error (tried with several problems, others don't have this issue):

Error: Could not find or load main class 
Caused by: java.lang.ClassNotFoundException:

System information

• OS: Linux
• Shell: zsh
• Python version: 3.9.1

All dependancies are installed.