Error in Compiling an existing design Quartus 20.1.0

I have inherited a design and have been compiling it with minor changes.

I would randomly get the following error from compile to compile in Quartus. Would just restart Quartus and the error would go away. But for the past several days, I just cannot get rid of the error and get a successful compile. The only logic change from the previous shipped build has been changes in the initialization value of a couple of registers.

11176 Caught exception

11176 Invalid device family 'Stratix V' specified

12154 Can't elaborate inferred hierarchy "sld_hub:auto_hub"

Quartus Prime Analysis & Synthesis unsuccessful. 3 errors, 8436 warnings.

This is running on the Linux 64 platform.

Note that the product this device belongs to is fielded and has been in operation for several years. Any pointers would be appreciated.

On the Intel/Altera support side, why are they shooting themselves in the foot by making it so difficult to get technical support? Xilinx has set up a Slack channel with our Company (and probably many others) where we can just communicate with the sales and support team on a daily basis and get guidance. When I try to file an SR with intel, I ended up in some Microsoft Azure website and I could not even understand the two page error message.