Unknown (9999) error in API call

When you receive an unknown (9999) error in your API this article will help you find the causes and the solutions to it. 

  1. Some input parameters are not correct
  2. Bug with the application

1. Some input parameters are not correct

Some input parameters are not in the correct format (integers, dates, strings).
How to find out
Check all data types and input values  of input parameters.
Make sure input values are in the expected format.
example, date types, enumerations, or integers.

2. Internal issue with the application

There is an internal error with the application.

Check the Nmbrs statuspage for incidents. If there's no active incident, send your request to our Dutch ticket form or to our Global ticket form




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