Custom services with fetch method

I've encountered with some problem with using custom service with custom widget api's method "fetch".

Here I have my custom service

Then I set my manifest.json dependencies field as shown in 

Then I've tried to use method fetch according to 

But got this error


My custom service is definitely visible from widget (checked it with "fetchHub" method to api/rest/services)
P.S. Sorry for bothering if it's impossible to use fetch method with custom services

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Is it possible to make the custom service and application names the same - e.g., TestApp? At the moment, your service name is TestService while application name is TestApp. Please let me know the results. 

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