Error while get gateway stats using API

Everithing is set up correctly but when I’m using the GetStas api from Lora App Gui to ask the gateway stat I receive the error shown in the attached image

Note that the gateway i sup and running and I can see some data exchange between gateway bridge and the mqtt broker by using the mqttfx client

Please note that you do have to provide a start and end timestamp. As you can see in the error message, it tries to parse an empty string into the format specified, which of course is failing.

here is the right result

ok show the mqttfx configuration please!