Error In Operation Group Assignment

[dmaier]

I received the error "ERROR IN OPERATION GROUP ASSIGNMENT" while opening a file that has toolpaths that I would like to export out. The file was originally created with 2018 and was accidently saved in 2019. The 2019 save is what created the group assignment error I am guessing. If I try to click on an operation I receive the message, "No operations were selected. Please select at least one operation." The screenshot does not show it, but I did have the green arrow selecting the folder icon next to the operation when trying to open an operation.  Is it possible to assign a group back to an operation or do I need to recreate my toolpaths?

[dmaier]

By adding a second machine definition to the operations, all my toolpaths were able to regenerate and I am now able to export them out to another file now.