what is BLSBacklightSceneUpdateAction?

My WatchOS sometimes just freeze and then I got this error message:


    "<BLSBacklightSceneUpdateAction: 0x18e539c0; info: <BSSettings: 0x18e70f40> {\n    (1) = No;\n    (2) = No;\n    (3) = Yes;\n}; responder: <_BSActionResponder: 0xc0084f00; active: YES; waiting: YES> clientInvalidated = NO;\nclientEncoded = NO;\nclientResponded = NO;\nreply = <BSMachPortSendOnceRight: 0xc008ca60; usable: NO; (496:aa9f:send-once xpcCode) from (34:59d07:send-once take)>;\nannulled = NO;>"

Does anyone have this issue? What is the reason and any solution for this? Thanks!