Hi,
we have installed upgraded the content server 6.6 sp2 to 7.0 while with process engine 6.7 sp2 to 7.0 now while working with process builder 6.7 sp2 when we try to open a smtp activity pallet is showing a pop up like
Failed to load due to error in the activity content. after clicking OK button again in an other pop up error details
Activity dfinition XML File is missing or invalid.
Help and let me know any further requirement.