Strange error on Adwords Express API (RequestError.UNKNOWN @)

Hi Guys,

I'm trying to get a list of my businesses using Adwords Express API.

I'm using my production developer token and test manager account.

On my account 2 Adwords express businesses exists.

When I make a call to API using ExpressBusinessService - RequestError.UNKNOWN @ error occurs.

Do you have any advices what is wrong in my account?

I can mention that my payments is not finished (Your ads aren't running because your account balance is exhausted. - Please make a payment. Fix it). Do I need to pay for my ads on test account?

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