Caught configuration exception (0), Can't find monitor rule

I've tried that. That's what got me into this predicament to begin with :).

I've created the sync-only group (had to specify Automatic Sync and Full Sync before I could even select the group from the Policy sync list). Once I tried to sync, it would say Sync Initiated for the device I was syncing from, and Not Available for the other devices sync status.

In the logs, on the original device, I see the error message The requested Policy Sync Status (/Common/[RestOfObjectName]) was not found.

On the other device I get a bunch of log entries:

(rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_data_168879_1" (in cmi) failed: No such file or directory (2) ) errno(0) errstr().
(rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_file_168883_1" (in cmi) failed: No such file or directory (2) rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_list_168881_1" (in cmi) failed: No such file or directory (2) ) errno(0) errstr().
(rsync error: some files could not be transferred (code 23) at main.c(1298) [receiver=2.6.8] ) errno(0) errstr().
(syncer /usr/bin/rsync failed! (5888) () Couldn't rsync files for mcpd. ) errno(0) errstr().
(rsync process failed.) errno(255) errstr().
Loading keys from the file.
Caught configuration exception (0), Failed to sync files..
Remote transaction for device group /Common/POLICY_SYNC_GROUP to commit id 355 6081167190376551560 /Common/[DeviceNameHere] 0 failed with error 01070712:3: Caught configuration exception (0), Failed to sync files...
(rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_data_168879_1" (in cmi) failed: No such file or directory (2) ) errno(0) errstr().
(rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_file_168883_1" (in cmi) failed: No such file or directory (2) rsync: link_stat "/.snapshots_d/policy_sync_d/:Common:POLICYSYNC_AAA_TEST:AAA_TEST_psd_list_168881_1" (in cmi) failed: No such file or directory (2) rsync error: some files could not be transferred (code 23) at main.c(1298) [receiver=2.6.8] syncer /usr/bin/rsync failed! (5888) () Couldn't rsync files for mcpd. ) errno(0) errstr().
(rsync process failed.) errno(255) errstr().
Loading keys from the file.
Caught configuration exception (0), Failed to sync files..
Remote transaction for device group /Common/POLICY_SYNC_GROUP to commit id 356 6081167199119309638 /Common/[DeviceNameHere] 1 failed with error 01070712:3: Caught configuration exception (0), Failed to sync files...
Loading keys from the file.
Sync of device group /Common/POLICY_SYNC_GROUP to commit id 359 6081167465374670520 /Common/[DeviceNameHere] 2 from device /Common/[DeviceNameHere] complete.
Sync of device group /Common/POLICY_SYNC_GROUP to commit id 359 6081167465374670520 /Common/[DeviceNameHere] 2 from device  complete.

We are running different minor version on these boxes. One is running BIG-IP 11.5.0 Build 4.26.245 Engineering Hotfix HF4 and the other is running BIG-IP 11.5.0 Build 2.0.231 Hotfix HF2. Only other thing is after I added both devices to the group, the status in the top left says Awaiting Initial Sync. I haven't seen in the docs that I need to do anything with this before the policy sync will work, so I haven't tried (that, and I don't want to overwrite any config other than the policies on my other device)