Unity Pro error message 'Project is read only'.

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Issue:
Error message is displayed when trying to open a Unity Pro project.

Product Line:
Unity Pro programming software

Resolution:
- Is the project open in another session of Unity?
- Go to the Windows Explorer. Right click on the project file and verify that the 'read only ‘ attribute is not set.
- Is the Unityxl.ini file attribute set for ‘read only’?
- Go to Tools – Options – Connection. Make sure that programming mode is set.
- File - Open. Make sure that 'read only mode' is not checked in the 'Open Options' in the lower left corner of the Open box.