- Which operating system are you using.
- What is the serial-to-usb converter on the board (it's the chip closest to the USP port); e.g. 16U2 (original Uno, some clones) or CH340 (most clones) or ...
- Please enable verbose output during upload and disable verbose output during compilation. Perform an upload and post the complete result here using code tags as described in how-to-get-the-best-out-of-this-forum#use-code-tags.
There are two places that are easy to check; in the tools menu and in the tool bar under the menu.