Fixing Errors in Bam Files

I am trying to run GATK4 Mutect2 on bam files from RNAseq data. I have run the ValidateSamFile program and have resolved all but one error. The remaining error is: ERROR: Mismatch between file and sequence dictionary

I’ve tried looking through the internet and can’t really find anything helpful to start resolving this. Does anyone have any idea how to resolve this error in Galaxy?

Thank you!