I am having a problem running a workflow I constructed. The workflow involves: 1) mapping DNA sequences to a reference genome (human hg19), 2) identifying variants using FreeBayes, and 3) annotating the locations of the polymorphisms using ANNOVAR. The programs run fine in my history, but when I extract a workflow and then try to run the workflow, things get hung up on the ANNOVAR step. An error message says "Required metadata values are missing". For some reason, the parameters from my history don't seem to transfer into the workflow. Also, I cannot edit this step at all in the workflow editor. How do I fix this?