[advh] E: failed to parse advertising API response

Hi, I'm testing the addenda ads insertion on a server with static JSON config on the same server, I have used the codes as showed on the technical page, for some reason I'm getting this error in the nimble log file and ads seems to be not working, Please help me , what went wrong with the config.
handler.json config
"contents":
[
{"id":"pre-roll","uri":"file:///var/nimble/ad/All_over_in_10_seconds.mp4"}
],
"rules":
[
{
"id":"ad01",
"protocols":["sldp", "rtmp", "hls"],
"users":[],
"type":"stream",
"app":"purple"
"stream":"thanthi12"
"time_sync":"stream",
"time_offset":20,
"time_interval":60,
"contents":[{"id":"pre-roll","onerror":"stop","wait":"10"}]
}
]
}

Nimle.config
advertising_url = file:///var/nimble/ad/handler.json
log_advertisements=true

Hello.

As for the provided file, you have errors in it, e.g. missing comma at line 11: "app": "purple "stream":"thanthi12"
Please validate your json first via some JSON validator.

Please also open a ticket at wmspanel.com/help and provide the exact error line you have in the log.

Thank you

Thank you, I will check it .