I did a search for this error and saw a couple of posts relating to Infuse 5 as well as some involving Plex.
I am getting this error on a daily basis when updating the library and then when trying to play a file I get the "error occured" message.
I force quit infuse on the ATV and then it seems fine. That is until i switch off the ATV (sleep) and boot up the next day.
I am running Infuse Pro 6.2.7
I do not connect via Plex
ATV 13.3.1 (4K)
Shares are on a WD Mycloud (Not WD Mycloud Home)
Shares are via SMB
ATV connected via GB Ethernet Cable
WD Mycloud connected via GB Ethernet Cable