That error happens when you try to use UI Builder custom components in a PDI that doesn’t have the ServiceNow Component Framework (SNC) installed. SNC isn’t part of PDIs by default — it’s a Store app that provides the runtime for custom components.

Go to the ServiceNow Store, search for “ServiceNow Component Framework (SNC)”, and install it in your PDI. Once installed, your custom component should load correctly in UI Builder.

If the issue is still present after this, you might have to try moving to a different PDI.