problem uploading sketch

every time I try to upload my sketch I get this error message at the bottom and I don't know what to do? I am using a mega 2560 r3 board on a windows 10.

"exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560."

When you encounter an error you'll see a button on the right side of the orange bar "Copy error messages". Click that button. Paste the error in a message here USING CODE TAGS (</> button on the toolbar).