Arduino software won't upload to Arduino Uno on a Mac

Hi all,

I am new on the forum and looking forward to learning a lot.

I have an Arduino Uno which works just fine with the arduino software on a Windows. However, on my Mac laptop, upon attempting to upload a sketch, this message appears:

avrdude: stk500_getsync()

over and over again.

Following the link did not yield any answers. It is not an FTDI issue as I downloaded the recommended FTDI driver and the issue did not go away. Also tried downloading an earlier version of Arduino - still no luck.

Any ideas how to fix this?

Many thanks and best wishes.