I clicked the "edit reputation reward" icon, and it crashed. Not sure why.

Crash report: crash-2021-11-09_22.00.15-client.txt
Game log: latest.log

Tested it with the same forge and HQM versions, but was not able to reproduce the issue. I have three ideas:

• Mod incompatibility or just plain issue caused by another mod.
  There are a lot of other mods present based on your crashlog, and I was unable to reproduce the issue with just forge and HQM. As such, some other mod could be a suspect, even if it doesn't seem too likely with the nature of the crash.
• Corrupted HQM jar.
  The issue is a failure to load a class (+ one more class-loading failure in the log) in HQM. As such, a possible cause could be that the jar file was corrupted during or after download.
• Outdated java version.
  I happened to notice a line in the log LEGACY JDK DETECTED, SECURED JAR HANDLING DISABLED, and that you're using java version 1.8.0_51, which is a fairly outdated version of java 8. I'm not sure how likely this is to be a cause, but it seems like a possibility.

Unless someone has any insight into this type of issue, the original poster need to do some testing to confirm or disprove the above ideas if we are to get any further on this.

Yeah, I've updated the mod a couple times since this happened and it seems to have been fixed. Will close the issue.