Question

[Efrenlee]

The B9 says it has a fatal error and it looks like this：B9PartSwitch has encountered a fatal error and KSP needs to close Fatal exception while loading tank type SSPXSlicates.What should I do？

 

 

[Gargamel]

Add-on question moved to modded support. 

[DeadJohn]

@Efrenlee Someone might be able to solve your problem from what you've already written, but in general you'll get better help by posting a link to your log file. That log file lets us know your KSP version, mods, etc. See the "How to Get Support" link below.

In the future, I also suggest using a more descriptive topic than "Question". Something like "Need help diagnosing B9PartSwitch fatal error" is more likely to be noticed by the relevant experts.

 

[zer0Kerbal]

10 hours ago, Efrenlee said:

SSPX

Do you have this installed? 

https://spacedock.info/mod/1682/Stockalike Station Parts Expansion Redux

that probably is your root cause: either old version, incorrectly installed, or not fully uninstalled.