Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions

okay so this happens with the windows10 OS only. The problem here is with your serial monitor. In windows, if you  try to upload the program while the serial monitor open, you cannot upload any sketch from that COM port.

So check if your serialmonitor with same port is open in some other arduino window. If it is open then close the serial monitor and then try uploading the sketch again. 

also note that this happens only when you try to do two things at the same port like you want to upload sketch and also you want to open serial monitor. 

it is possible to run multiple COM port serial monitor in multiple windows but with different PORT selection. 

ultimately for your problem try to check if the serial monitor with same port is open in some other window. 

Several times, while working on arduino, I faced same Issue, because I clicked on the serial monitor icon on arduino IDE, I got this same error during compilation and upload especially while started uploading. I think you clicked on the serial monitor icon during uploading code, and then you got this error. Just leave your IDE and OS to compile and upload the sketch. Similarly if there is an issue with the already opened serial monitor at same COM port, with which arduino is connected, then I recommend you to close that window and after that upload your sketch. Here I would like to recommend you to contact the SSLA technical support team for getting better assistance in your project issues.

Several times, while working on the arduino, I faced the same Issue, because I clicked on the serial monitor icon on the arduino IDE, I got this same error during compilation and upload especially while I started uploading. I think you clicked on the serial monitor icon during uploading code, and then you got this error. Just leave your IDE and OS to compile and upload the sketch. Similarly if there is an issue with the already opened serial monitor at the same COM port, with which the arduino is connected, then I recommend you to close that window and after that upload your sketch. Here I would like to recommend you to contact the Sierra Software Ltd. technical support team for getting better assistance in your project issues.