just few days ago my Nexus 5 stopped syncing google contacts (all other google products are working)
I am able to access all my contacts online via a browser as well as on my other android phone that has no syncing problem.
After going round different platforms, I came across this platform and followed the guide for saving bug report. Attached the bug report as well as a screenshot of me trying to debug sync tester under development tools in the developers menu. The screenshot shows that there is no available account that the com.android.contact - com.google.android.gm.exchange> adapter could be linked to.
the code obtained from the report is as follows: