The below error can occur when trying to modify Run Parameters, or when creating a new run set. Upon selecting the set, the error appears.
The execution session (containing the run state) for the data flow is corrupt.
The team are working on a fix, but in the meantime you should use the following workaround.
- Export the data flow
- Delete it
- Import it back into the Analyze Directory
Alternatively, use the "Save As" option, and save the data flow to a new name.