Serialization of 'Closure' is not allowed | While exporting large dataset using maatwebsite laravel

Question

I was trying to export ~20k datasets from the database using queue in maatwebsite. Below code base is perfectly working in localhost.
But when I uploaded it to my digital ocean server it was giving me Serialization of 'Closure' is not allowed Internal Server Error.
I'm using Maatwebsite Excel for exporting to excel files.

Export File Codebase: https://i.ibb.co/yPW3Gr9/screely-1649409743160.png

Controller File Codebase: https://i.ibb.co/F4cKF7m/screely-1649409670775.png

Please guide !!!