laravel snappy pdf: getting an error the file was not created - laravel

Question

I have about 1500 students in my database and I need to generate an invoice for each one. For this purpose I am using this library https://github.com/barryvdh/laravel-snappy . When I try to generate I get this error:
The file '/var/www/skmpastebimaslt/public_html/storage/checks/24767 Dominykas Butkevičius 1581703819.pdf' was not created (command: /usr/local/bin/wkhtmltopdf --lowquality '/tmp/knp_snappy5e46e28b5d61f2.13362077.html' '/var/www/skmpastebimaslt/public_html/storage/checks/24767 Dominykas Butkeviius 1581703819.pdf').
https://gyazo.com/3a3f60713601a663a1360cd65fee9914
Invoices are generated for four users then the app crashes. The most interesting thing is that even though the error says the file was not created but it was created, I can find it in my storage folder.
My code:
public function saveCheckPdf(Student $student, Check $check = null, $fileName = null)
{
if (empty($fileName)) {
$fileName = 'kvitas_' . time() . '.pdf';
}
$path = storage_path('checks/' . $fileName . '.pdf');
$this->renderCheckPdf($student, $check)->save($path);
return $path;
}
private function renderCheckPdf(Student $student, Check $check = null)
{
$bills = $this->billRepository->getCurrentSeasonBills($student->id);
$payments = $this->paymentRepository->getCurrentSeasonPayments($student->id);
$fileName = $student->fullname . ' kvitas';
$billsSum = $bills->sum('sum');
$paymentsSum = $payments->sum('sum');
if (empty($check)) {
$check = !empty($student->checks[0]) ? $student->checks[0] : false;
}
return newPDF::loadView('student.check_pdf', compact('student', 'payments', 'bills', 'billsSum', 'paymentsSum', 'fileName', 'check'));
}
Then I just loop through each user and call saveCheckPdf method in my controller like this
$this->pdfService->saveCheckPdf($student, null, $student->id . ' ' . $student->fullname . ' ' . time());
Maybe anyone faced the same problem?