Symfony Error - Please help

My hosting company recently forced me to move to a new server infrastructure. They handled the migration, but since the move, the site has had an error. The error occurs when I'm in the Admin section of the site and I open a customer order. Then, when I attempt to click on a product that the customer purchased, a page loads with a "runtimeerror". The text at the top of the screen says the following:

"An exception has been thrown during the rendering of a template ("Warning: Undefined property: Symfony\Component\VarDumper\Caster\CutStub::$cache_locking")."

Can anyone help, please? Is this a file permissions issue? I'm not skilled in Presta so would appreciate any advice.

Thanks in advance