I am using the lastest version of the board definition "Arduino Core for STM32 2.10.1". Do I have to use the older 2019.12.8 definitions ?

I am using the lastest version of the board definition "Arduino Core for STM32 2.10.1". Do I have to use the older 2019.12.8 definitions ?

I am trying to compile a sketch with mysensors library for a generic STM32F1 BluePill C8 board.
Arduino IDE throughs me following error: "\Arduino\Sketches\libraries\MySensors/MySensors.h:84:2: error: #error Hardware abstraction not defined (unsupported platform)"
I have installed the STM32 board definitions from ST.
Defined board: "Generic STM32F1 series" in the Arduino IDE.
To my knowledge should the mysensors library work with STM32F1 boards.
Any idea where the problem could be?

Re: Sensebender Gateway

I have ordered my Sensebender GW from idead, soldered it and added a RFM69.
When I am trying to upload a modified serial sketch via the Arduino IDE 1.8.7, I am getting after quite long time (2 -3 minutes) the error message, that the upload has filed due to an error. However, no specific reason is given what kind of error has happend.
No error message was created while compiling the sketch.
Has anyone an idea, what could cause this problem? In the Arduino IDE everthing should be installed as required (Sensbender GW board, SAMD driver, mysensor library).