int timervalue = testtimer().ReadTimer();

[...]
#include "timerms.h"

[...]

class botInfo
{
   // Put bot data here
   timerms testtimer();
[...]

#include "spawn.h"
[...]
void botInfo::gotHelp(Player *p, Command *c)
{
[...]
int timervalue = testtimer().ReadTimer(); //Could be any other non-void call, it does the same error
[...]

#include "spawn.h"

#define NOT_INITIALIZED -1

class timerms
{
   int starttime;
   int pausetime;
   
public:
   timerms()
   {
      ResetTimer();
   }
   bool isrunning;
   bool ispaused() { return (!isrunning && pausetime != NOT_INITIALIZED);}
   void StartTimer(int starttime);
   void StartTimer();
   void PauseTimer(int pausetime);
   void PauseTimer();
   void ResumeTimer(int resumetime);
   void ResumeTimer();
   void ResetTimer();
   int ReadTimer();

   ~timerms()
   {
   }
};

#include "spawn.h"

[...]

int timerms::ReadTimer()
{
   return 0; //No matter what code in here, gives the same error
}

timerms botInfo::testtimer()
{
   //Stuff
}

class botInfo
{
   // Put bot data here
   timerms testtimer();