ISR(TIMER1_OVF_vect) is not compiling ?

[b707]

Sorry, there are a lot of problems in your code. The very first thing is that the C language does not allow functions to be defined inside other functions:

@magnetstein

void loop(void) {
        
        ISR(TIMER1_COMPA_vect)  //That´s the spot where the Hamster starts to hobble !
         {
        CounterVar ++ ;
         }

this is the reason for the error that started the thread

Besides this, there are other problems here.
For example, you can't set the same macro more than once - they simply won't work:

@magnetstein

//Batterie state immage flatt
 #define cross_width 46
 #define cross_height 11
 ....
 #define cross_width 13
 #define cross_height 6
 

In general, before proceeding I recommend to review basic syntax concepts such as procedures, functions, code blocks, variable definitions and constants.