error when trying to populate combo box values using extjsdirectspring

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Greetings

I am a newbie in extjs. I am trying to populate a combo box with values from a java class using extjsdirectspring.

I tried to follow the examples that Ralph Schaer (a big thanks to him to share this plugin and the examples) shared on the github repository.

but i am getting the following error

Uncaught ReferenceError: DocbaseMapImplService is not defined LoginuserForm.js:27
Ext.define.initComponent LoginuserForm.js:27
Ext.define.constructor ext-all.js:27
b.implement.callParent ext-all.js:27
Ext.define.constructor

I request the experts to let me know what i am doing wrong.

Is the login form being created before the direct api is returned? Is that what DocbaseMapImplService is from?

test with a Json file first.

Test with Json file first, before using extjsdirectspring.