You need to upgrade Sencha CMD, e.g. by using "sencha upgrade" on the command line or via https://www.sencha.com/products/extjs/cmd-download/ . Make sure that you are at least using version 7.2.0.66

In case you made studio customizations you might need to check the upgrade notes for possible API changes on ExtJS side between 6.5.0 and 7.2.0 (see https://docs.sencha.com/ ). Compared to other ExtJS upgrades we only experienced minor issues here.

You will no longer need to manually adjust the sencha.vmoptions file located in the Sencha CMD installation folder. This is now handled by a new configuration option in the jangaroo-maven-plugin. For the studio-base-app the default memory settings are set to: "-Xms512m -Xmx2048m". These can be customized via the newly introduced property studio-base-app.senchaJvmArgs .