stm32 proble UART and RTC internal

[max.tisc]

hello,
I bought the ARM FC10 package for the moment with a hobby license, in the hope of solving some problems that arose with the programming of STM32 devices with FC9, with the help of LeighM some problems were solved such as internal RTC, others remained such as reading data via RS232 sent from a nextion display, or these parts of code are inserted into a larger program they stop working and block everything. I made 2 identical codes as a test, on FC9 it works, on FC10 the transmission of RTC data to the display does not work, (see screenshot that the closing of the data package is incorrect) nor the reading of the serial, but if I exclude the RTC part from the code the reading of the serial works again. is there a method to export a code previously made with FC9 and import it on FC10? I simply opened the FC9 code with FC10 maybe this is the error?
I attach the two codes
thanks