Failed to parse configuration for gameId: xxxxxx System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()

Please help me to resolve these errors.

(1)
Failed to parse configuration for gameId: xxxxx System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()
(2)
{"enabled":true,"assetCaching":"forced","projectId":"xxxxxxxxx","placements":[{"id":"video","name":"Video","default":true,"allowSkip":true,"disableBackButton":true,"muteVideo":false,"useDeviceOrientationForVideo":false,"adTypes":["MRAID","VIDEO"],"skipInSeconds":5,"skipEndCardOnClose":false,"disableVideoControlsFade":false,"auctionType":"cpm","useCloseIconInsteadOfSkipIcon":false,"banner":{"refreshRate":30}},{"id":"rewardedVideo","name":"Rewarded Video","default":false,"allowSkip":false,"disableBackButton":true,"muteVideo":false,"useDeviceOrientationForVideo":false,"adTypes":["MRAID","VIDEO"],"skipEndCardOnClose":false,"disableVideoControlsFade":false,"auctionType":"cpm","useCloseIconInsteadOfSkipIcon":false,"banner":{"refreshRate":30}}],"organizationId":"xxxxx","developerId":xxxx,"properties":"","loadV5Enabled":false,"analytics":false,"abGroup":0,"token":"","country":"","subdivision":"","gameSessionId":"","disableAdUnitExperiments":false,"ageGateLimit":0,"coppaCompliant":false,"gamePrivacy":{"method":"unity_consent"},"gdprEnabled":false,"legalFramework":"","optOutEnabled":false,"optOutRecorded":false,"srcPayoutType":"cpi"} System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()
(3)
Find can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()
(4)
Invalid configuration request for gameId: xxxxx System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()
(5)
Find can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()
.
please help me to resolve these errors.