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Mark Campbell 22Mark Campbell 22 

Can't use Pardot Lightenting - Persistent error "An error has occurred - This page has an error. You might just need to refresh it."

I set up a Developer Sandbox account for Pardot, and when navigating to the Pardot Settings, or almost any tab in pardot I get the following error:
 

An error has occurred
This page has an error. You might just need to refresh it.

See screenshot.

User-added image

I've tried a bunch including updating company profile ect. Nothing seems to work. Any ideas?

Baya AdamBaya Adam
Information Transformation Services is endowing the clients with a stunning and impressive visual experience crafted by 3D Modeling Services. We are completely forted to offers our customers with a range of appealing 3D designs that are carefully crafted to meet with all type of requirements. 
 
Shashika WijesiriShashika Wijesiri
Mark Campbell 22, did you find a solution for your issue? I've faced the same issue in one of the sandboxes.
PravegPraveg
Try these steps might help. I got the solution from these steps.
1-Setup>Connected app>Connected apps Oauth Usage > Block or unblock the app.
2-Setup>Connected app>Manage Connected app>open app> Edit policies edit check accebility and save again.