Check AEM Run Mode

Navigate to the below:

/system/console/status-slingsettings

and get proper values under 

Run Modes = [crx3tar-nofds, stage, crx3, nosamplecontent, author]

Remove Keystore from AEM User

For example, if needed to remove Dynamic Media Replication user keystore, just delete from CRX/DE the keystore from /home/users/system/dam/dynamic-media-replication.