Shows help message for broken require in scheduler adapter (#7706)

closes #7584

- added help message to assist in debugging broken require

core/server/scheduling/utils.js

@@ -38,7 +38,7 @@ exports.createAdapter = function (options) {
         }
         // CASE: if module not found it can be an error within the adapter (cannot find bluebird for example)
         else if (err.code === 'MODULE_NOT_FOUND' && err.message.indexOf(contentPath + activeAdapter) === -1) {
-            return Promise.reject(new errors.IncorrectUsageError({err: err}));
+            return Promise.reject(new errors.IncorrectUsageError({err: err, help: 'Please check the imports are valid in ' + contentPath + activeAdapter}));
         }
     }