Conflict between two different versions

Problem/Motivation

When running composer install: Root composer.json requires dompdf/dompdf ^3.0, found dompdf/dompdf[v3.0.0, v3.0.1, v3.0.2, v3.1.0] but these were not loaded, likely because it conflicts with another require.

Steps to reproduce

Try installing the dompdf/dompdf 3.0.0 package in composer and try installing pdf_generator
- composer require dompdf/dompdf:"^3.0"