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In Eclipse projects the .settings folder is usually not maintained by the user and also hidden. It may contain files which happen to have the same extension as a DSL file (like ".component" or similar). The Xtext UI builder then may pick them up and put error markers on the file and project. I am not sure what the best solution is, maybe a better user experience would be that the Xtext builder running in the UI should ignore the .settings folder by default.