Add instructions to run automigrate

code/lib/core-common/src/utils/validate-config.ts

@@ -16,7 +16,10 @@ export function validateFrameworkName(frameworkName: string) {
   if (rendererNames.includes(frameworkName)) {
     throw new Error(dedent`
       Invalid value of ${frameworkName} in the 'framework' field of Storybook config.
-      Please see the v7 Migration guide for more information: 
+
+      Please run 'npx sb@next automigrate'
+
+      See the v7 Migration guide for more information: 
       https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#framework-field-mandatory
       `);
   }