Q:

Flag reason for closing as offtopic because of modded Minecraft tech support

Crashes etc.  of modded Minecraft are off-topic here.  But what is the appropriate flag? 

The content is not unreleased or illegal. 
It's not about game design/development. 
It's not asking to identify or recommend a game. 
It has to do with gaming. 
It doesn't belong on a different SE site. 

A:

I think most people vote to close the question as either unclear what you're asking or too broad.  Both of these reasons fit well enough, since without a list of mods the question is obviously unclear (since we don't have enough info to accurately assess the situation to begin with), or if they do have a list, it's still too broad because any of those mods could be causing the issue. 