Serelization of "MongoDB\BSON\UTCDateTime" is not allowed

I have laravel project with MongoDB. Now in this project I am trying to use cache. and I have completed testing on local. but on server while generating cache it throws error below.

serialization of 'MongoDB\BSON\UTCDateTime'

and it was working fine on local. the versions on server are as below.

MongoDB v3 Php 7.0 Laravel 5.1

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