This fatal error also occurred to me when I added custom listing/grid. I fixed this issue by changing constructor and initiating correct collection for my data listing/grid in data provider constructor. Example of custom grid DataProvider.php

use Acme\CustomModule\Model\ResourceModel\Entity\Listing\CollectionFactory;

class DataProvider extends \Magento\Ui\DataProvider\AbstractDataProvider
{
    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        CollectionFactory $collectionFactory,
        array $meta = [],
        array $data = []
    ) {
        parent::__construct($name, $primaryFieldName, $requestFieldName, 
        $meta, $data);
        $this->collection = $collectionFactory->create();
    }

    public function getData(): array
    {
        $collection = $this->getCollection();
        return $collection->toArray();
    }
}

But you need to create \Acme\CustomModule\Model\ResourceModel\Entity\Listing\Collection and follow Raphael at Digital Pianism approach

This fatal error also occurred to me when I added custom listing/grid. I fixed this issue by changing constructor and initiating correct collection for my data listing/grid in data provider constructor. Example of custom grid DataProvider.php

use Acme\CustomModule\Model\ResourceModel\Entity\Listing\CollectionFactory;

class DataProvider extends \Magento\Ui\DataProvider\AbstractDataProvider
{
    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        CollectionFactory $collectionFactory,
        array $meta = [],
        array $data = []
    ) {
        parent::__construct($name, $primaryFieldName, $requestFieldName, 
        $meta, $data);
        $this->collection = $collectionFactory->create();
    }

    public function getData(): array
    {
        $collection = $this->getCollection();
        return $collection->toArray();
    }
}

But you need to create \Acme\CustomModule\Model\ResourceModel\Entity\Listing\Collection to get it's data in data provider