I am using a composer library in my custom module. The link for the library is here.

This library in turn uses https://github.com/tightenco/collect

The {Vendor}/{Module}/composer.json is

 "name": "vendor/moduleName",
 "description": "A module description",
 "type": "magento2-module",
 "version": "1.0.0",
 "license": [
"require": {
"php": ">=7.1.0",
"flagshipcompany/flagship-api-sdk": "dev-master"
"autoload": {
   "files": [ "registration.php" ],
   "psr-4": {
  "Vendor\\Module\\": ""

When I add the code

require BP.'/app/code/{Vendor}/{Module}/vendor/autoload.php'

to the controller, it crashes. The Exception is

 Source class "\Illuminate\Support\HigherOrderCollection" for "Illuminate\Support\HigherOrderCollectionProxy" generation does not exist.

Things that I have tried and haven't worked-

Cleared cache numerous times

Ran setup:upgrade

Ran setup:di:compile - give same error as the exception mentioned above

Any suggestions will be much appreciated. TIA!

P.S. - I am using Magneto2.3-develop and PHP 7.2

All folders have the necessary permissions

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