Sequence stopped. Fatal error, the given key was not present in the dictionary.

Does it give a stack trace with the error?  Does it seem to happen with a particular method in the sequence?  I assume you have also tried a different sequence file?  What O/S version?

We would need to look at the sequence_info.log from the sequence that gave this error. It will be located in d:\masshunter\gcms\1\logs folder. Have you tried just Method.. Run Method and does that work? Have you tried building the sequence from default.sequence.xml?

Hello chemist23,

I just wanted to follow-up to see if this issue is resolved. If so, please come back to the post, let us know what you found, and click Verify Answer on the response so it will make the solution more visible.  If you still need help, just let us know and we would be happy to continue working with you.

Wasn't able to determine the root cause, but building a sequence from scratch seems to solved the issue.