WebSphere: A composition unit with name already exists.

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Issue: A composition unit with name <APP_NAME> already exists.Select a different application Name

Solution:

Sometimes this error will come even after deleting the application from WAS.

Remove the application references from the below paths.

<WAS_INSTALLATION_PATH>/Dmgr01/config/cells/<CELL_NAME>/blas/
<WAS_INSTALLATION_PATH>/Dmgr01/config/cells/<CELL_NAME>/cus/


removing the application references from the above paths will resolve the problem

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