https://community.appian.com/discussions/f/administration/7038/hi-all-we-are-in-middle-of-migrating-from-appian-7-8-to-appian-16-1HI all, we are in middle of migrating from Appian 7.8 to Appian 16.1. We are not using a repository , till now we modify the configuration files directly. Does anyone knows what is the problem wit my configuration.See the logs bellow. BR,Natasa serveren-USTelligent Community 12https://community.appian.com/thread/28265?ContentTypeID=1Wed, 24 Feb 2016 18:45:51 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:d3c33b90-8041-4f86-be0e-0756034d2da0Nick VigilanteIt looks like your current custom.properties is using conf.data.primary.datasource instead of conf.data.APPIAN_DATA_SOURCE. This is the error I see:<br /><br />Caused by: com.appiancorp.rdbms.config.PrimaryDataSourceNotConfiguredException: com.appiancorp.suiteapi.common.exceptions.AppianException: FATAL: No value configured for conf.data.APPIAN_DATA_SOURCE in custom.properties. An Appian datasource is required. The Appian application will fail to deploy. (APNX-1-4179-003)<br /><br />Stop the app server, make the changes in custom.properties, rename any marker files to .dodeploy and start it up again and that should take care of that issue.<div style="clear:both;"></div>