Thread:Project:Support desk/Problem With File Upload: Could not acquire lock for "mwstore://local-backend/local-public/1/1e"./reply (17)

You should not change the FileBackendGroup.php file if you apply the configuration change I suggested, supposing it solves the problem on upload.

If you have problems displaying images, be sure that configuration settings are placed at the bottom of LocalSettings, since you can see there that it uses other variables that should be already defined. If that does not work, you may try manually editing those settings replacing variables (those starting with "$") with the actual values it should contain.