AXE027 Serial port error - port not present or already in use!

Hello. I'm trying to download a program to my board and when I click "prgram" appears this: Serial port error - port not present or already in use!

I think It happens because I programmed this:
main:
readadc c.0,b0
debug b0
pause 1000
goto main

And I didn't disconnected it well...
It happened to me another time with another board, but I didn't do anything.

Sorry if my English is bad, I'm Spanish.
Thank you.

I got this error when I had forgotten to plug in the USB. Doh! You might try unplugging and plugging the AXE027.

go to Options/Serial Port and click on the line that shows your cable as 'Ready for use'. To assist Windows to find the drivers, use the same USB socket each time.

Hi, your English is fine.

It has nothing to do with any code you may have written, it is exactly as the error message says.
There could be many reasons that the port is not available, have you had/have any other programs running which use that port?

Check that your options are actually set for the port that your AXE027 is connected to.
Make sure no other programs (eg terminal emulator) are trying to use the same port.

Try a re-boot of your PC if you cannot find any of the above.