Error: The project will be opened as READ only.

When opening a project I get the below msg. How do I fix it to open normally. The msg pops up for each scenario too.

Check whether you have multiple PTW open. Go to your task manager and look for processes to see if more than one PTW32.exe is running. If this is the case, end all PTW32.exe and re-open the project.
Creation date: 3/30/2016 2:44 PM      Updated: 3/30/2016 2:44 PM