Troubleshooting > System Architect XT error messages and problems > Unable to check out license
  
Unable to check out license
Possible causes
The license feature is not available
Check the following features in the license file and the feature named SA-XT.
For Reader: SA-XT-Read.
For Updater: SA-XT-Read-Write.
The license is already checked out
Ensure that concurrent licenses are not in use.
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System Architect XT error messages and problems