improved error message if more than one component testing plugin is l…

…oaded

lib/utils/addDetailedError.js

@@ -11,9 +11,16 @@ module.exports = function(err) {
         'object globally too soon, either in your test or other Nightwatch related files';
     } else if (/\.page\..+ is not a function$/.test(err.message)) {
       detailedErr = '- verify if page objects are setup correctly, check "page_objects_path" in your config';
-    } else if (err.message.includes('browser.mountComponent is not a function')) {
-      detailedErr = '  - writing a component test? - make sure to install the necessary plugins (e.g. @nightwatch/react or @nightwatch/vue)';
+    } else if (err.message.includes('.mountComponent() is already defined.')) {
+      detailedErr = '  - running component tests? loading multiple plugins together is not supported.';
+      err.help = [
+        'check your nightwatch config file (e.g. nightwatch.conf.js) and inspect the line with "plugins": [...]',
+        'make sure to load only the plugin for the intended framework (e.g. either load @nightwatch/react or @nightwatch/vue, but not both together)'
+      ];
+
       err.link = 'https://nightwatchjs.org/guide/concepts/component-testing.html';
+    } else if (err.message.includes('browser.mountComponent is not a function')) {
+      detailedErr = '  - writing an ES6 async test case? - keep in mind that commands return a Promise; \n      - writing unit tests? - make sure to specify "unit_tests_mode=true" in your config.';
     } else if (/\w is not a function$/.test(err.message)) {
       detailedErr = '  - writing an ES6 async test case? - keep in mind that commands return a Promise; \n      - writing unit tests? - make sure to specify "unit_tests_mode=true" in your config.';
     }

lib/utils/logger/index.js

@@ -360,7 +360,7 @@ class Logger {
       return ' ' + message.join('\n ');
     }
 
-    if (!showStack && !this.isAssertionError(error)) {
+    if (!showStack && !this.isAssertionError(error) && !error.help) {
       return '\n' + boxen(`${message.join('\n')}\n`, {padding: 1, borderColor: 'red'}) + '\n';
     }