TROUBLESHOOTING: Bad Request' for url: '.../bea_wls_deployment_internal/DeploymentService (upon WLS deployment)

Error

weblogic.deploy.api.internal.utils.DeployerHelperException: The source '/tmp/ApplicationGreeceDEV.ear' for the application 'ApplicationGreeceDEV#2.0'
could not be loaded to the server 'http://127.0.0.1:7007/bea_wls_deployment_internal/DeploymentService'.
Response: '400: Bad Request' for url: 'http://127.0.0.1:7007/bea_wls_deployment_internal/DeploymentService'

Solution
I know it seems silly but do not waste time. Just restart server.