Then something really bad must have happened either in RME, CS, or both. For example, 10.228.19.231 has a DCR ID of 63 according to RME, but this ID doesn't exist in the DCR database.
Assuming these devices are still valid in your network, try deleting them from RME, then re-add them. Start with one device (e.g. 10.228.19.231). Make sure that when you re-add it inventory and config archive work once again. If so, do the remaining of the failing devices.
Looks like a FLASH-MIB timeout may be happening. Go to RME > Devices > Device Management > RME Devices, select the device in question, and edit its attributes. Increase the SNMP timeout for this device. I cannot say what to increase it to, because the log does not appear to be complete.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...