Description
The XServer process did not start because an expected GAIT file was missing. The expected format of the file name is rungait<version>-runx.bat, for example, rungait28-runx.bat. The file should be in the GAIT home directory.
Solution
If the file name has been changed to a different format, you can modify the GAIT_SESSION_CONFIG.xml file in the <ArcGIS Pro Installation location>\Resource\Defense folder and set the XML BatchFileName element to the file name for the version of GAIT you have installed.