Refresh Task queued but not processed

Hi,
when I use this provision
let serial = declare(“Device.DeviceInfo.SerialNumber”, {value: 1}).value[0];
declare(“InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.SSID”, null,
{value: serial});

I click refresh “Task queued but not processed”
and appear this

After I change this script to :
let serial = declare(“InternetGatewayDevice.DeviceInfo.SerialNumber”, {value: 1}).value[0];
declare(“InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.SSID”, null,
{value: serial});

and click refresh ,it appear “Task queued but not processed”

until I DELETE the fault information, click refresh ,it work,
I want to know Why I change the provision,it can’t work until I destroy the fault information.

and I also want to know what’s mean of {value: 1}
as I understand ,it mean timestamp value =1 ,use to get old value.right?