i have also the same problem whenever I install SUITECRM in domian.com, it gives me the error in the browser as
# Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log.
I have also checked the error log
Thu Dec 26 09:06:49 2019 [-none-][FATAL] User update error: Temp User is not retrieved at ID 1, boolean given Thu Dec 26 09:06:49 2019 [-none-][FATAL] Email address save error