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Problems with Timer in Encoder-Mode on STM32F429-Discovery

Hello everyone,

I Have a problem getting the Timer2 on my STM32F429-Discoveryboard working.
I configured the Timer2 in Ecoder-Mode, using CubeMX, and copy+pasted the code into the workbench and flashed it onto the controller.
Somehow the counter value of TIM2 stays at 0 (Encoder-Signals are working I checked it with my Oscilloscope)
Also it was not possible to get the value of TIM2 using the debugger. Instead the following error was shown in the Expressions-Window:
------------------
Multiple errors reported.

1) Unable to create variable object

2) Failed to execute MI command:
-data-evaluate-expression TIM2
Error message from debugger back end:
No symbol “TIM2” in current context.

3) Failed to execute MI command:
-var-create - * TIM2
Error message from debugger back end:
-var-create: unable to create variable object

4) Failed to execute MI command:
-var-create - * TIM2
Error message from debugger back end:
-var-create: unable to create variable object
-----------------------

I debugged now quite a while and I dont know where else I should look for the Error. Maybe someone has a good idea?

Attached is the code I’m using. Timer 2 set up in Encoder mode, Encoder Phase A on PA5, Encoder Phase B on PB3: