An openhab error in syslog

  • Hardware: Raspberry PI3 B+
  • OS: Debian 10
  • openHAB version: 3.1.0
  • Issue: I have a unusual behaviour in the sitemap, sometimes a video stream is not displayed,
   Frame label="ZoneMinder Video" {
   	Text item=DataOraNow label="rilevazione: [%1$td.%1$tm.%tY %1$tH:%1$tM]" 		
   	Video item=ZM550_Monitor1_VideoUrl url="" encoding="mjpeg"
   	} 

So I checked all the possible logs including syslog, and I discovered a recurring error (below) that I cannot understand. I do not know if it is connected with the sitemap strange behaviour, but however it is an error.

Any suggestion? Thanks

Dec 18 12:32:50 openhabian frontail[1478]: undefined:21
Dec 18 12:32:50 openhabian frontail[1478]:     "ModelRepositoryImpl": "background-color: #a6cffd; font-weight: bold"
Dec 18 12:32:50 openhabian frontail[1478]:     ^
Dec 18 12:32:50 openhabian frontail[1478]: SyntaxError: Unexpected string in JSON at position 896
Dec 18 12:32:50 openhabian frontail[1478]:     at JSON.parse (<anonymous>)
Dec 18 12:32:50 openhabian frontail[1478]:     at Object.<anonymous> (/usr/lib/node_modules/frontail/index.js:114:30)
Dec 18 12:32:50 openhabian frontail[1478]:     at Module._compile (internal/modules/cjs/loader.js:1072:14)
Dec 18 12:32:50 openhabian frontail[1478]:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
Dec 18 12:32:50 openhabian frontail[1478]:     at Module.load (internal/modules/cjs/loader.js:937:32)
Dec 18 12:32:50 openhabian frontail[1478]:     at Function.Module._load (internal/modules/cjs/loader.js:778:12)
Dec 18 12:32:50 openhabian frontail[1478]:     at Module.require (internal/modules/cjs/loader.js:961:19)
Dec 18 12:32:50 openhabian frontail[1478]:     at require (internal/modules/cjs/helpers.js:92:18)
Dec 18 12:32:50 openhabian frontail[1478]:     at Object.<anonymous> (/usr/lib/node_modules/frontail/bin/frontail:2:1)
Dec 18 12:32:50 openhabian frontail[1478]:     at Module._compile (internal/modules/cjs/loader.js:1072:14)
Dec 18 12:32:50 openhabian systemd[1]: frontail.service: Main process exited, code=exited, status=1/FAILURE
Dec 18 12:32:50 openhabian systemd[1]: frontail.service: Failed with result 'exit-code'.