every time when compile and upload any code that problem occurs. I talked to the seller and it is changed I openedthe box and try again. I have seen the problem again.
"Low memory available, stability problems may occur."
have you any idea why?
every time when compile and upload any code that problem occurs.
"That problem"? You've had too much to drink? That problem? Erectile dysfunction? That problem?
have you any idea why?
Not without knowing what code is producing what problem on what version of the IDE for what Arduino.
When I first tried linefalowing code was working but I was then upload logo upload code but just went straight after I upload compass code worked well, but no other code is no longer upload .
hi we didin't drink too much 
but it isn't about the code because we used example codes. I think "line following code". The seller said that that is "hardware problem". And changed the arduino robot. The problem happend again