Monitor Error 3: Cannot Write to Address

I'm trying to load an application into external RAM memory, but I get a long list of "Monitor Error 3: Cannot Write to Address xxxx". However, when running a small program from flash, I can use a function...
Monitor Error 3: Cannot Write to Address

I'm trying to load an application into external RAM memory, but I get a long list of "Monitor Error 3: Cannot Write to Address xxxx". However, when running a small program from flash, I can use a function...
Monitor error 26: Cannot write interrupt vector on ADuC812

Hi! I have the problem with stopping program execution on serial interrupt with mon51. When I check option 'Stop program execution on serial interrupt' I get 'Monitor error 26: Cannot write interrupt...
Monitor error 26: Cannot write interrupt vector on ADuC812

Hi! I have the problem with stopping program execution on serial interrupt with mon51. When I check option 'Stop program execution on serial interrupt' I get 'Monitor error 26: Cannot write interrupt...
MONITOR 51 ERROR 21: NO BREAKPOINT AVAILABLE

Hi, I'm getting this error too often. what does it mean ??? I define breakpoints and they are ignored by monitore 51 ? no matter where they are ? why ? TIA