Missing or invalid activity issues

I was given a project at work to take over with very little explanation or documentation to help me out. I am trying to figure out why I am getting so many “Missing or invalid activity” error messages. I have went into the logs to try and determine which package the activity belonged to and I have installed, uninstalled, upgraded and downgraded several activity packages in an effort to get the activities to show up. The person who was originally working on this project no longer works here, so there is no way for me to contact them and find out what they were doing with the activity. Below are some informative screenshots to help you all determine where I am at with this issue.


I’m not sure that gonna help, but worth to at least verify it. Have you looked into the project.json file? To see if the name of the activity that was used is there.