App not loading in designer

I have imported a number of apps I was working on in AppyBuilder.
When I go to open some of them they hang on the loading screen and I cannot get in to edit them.
I notice that all the ones that hang came up with an error when importing them about the Spacer component not being valid.
Most of my apps use this AppyBuilder component. When will this problem be fixed so i can import again?
I don’t want to have to go through each app and remove the Spacer component in order to import.

Then you must wait for the component migration to complete

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