[Superpat]

What does the error say? Maybe turn verbose logging in the IDE options.
IDE issues are usually because of the required libraries are missing or in the wrong location.

|Hi Uncle Bob

Please read what I wrote!

When using 1.8.3   The sketch compiled OK!      ( The required libraries were in the present and in the correct locations! )

But

The compiled software would only upload to the device flash for about 5/6 seconds. The upload then hung until the watchdog timer timed out and the IDE reported "timeout"

Using the SAME library and sketch, IDE v1..8.1 complied and UPLOADED with no problems.

IDE v 1.8.3 worked OK reading from the micro , no problems. It just gives up on the write to the device, after about a third of the upload.

I cannot give you any more details errors unless I reinstall IDE v1.8.3 again.

cheers

Patrick