Problem with Theme Manager after upgrading to Wappler 4

After upgrading to v4, I was expecting some problems with Bootstrap themes. With the first site I opened, the custom them (Bootstrap 4) had been replaced by the default theme. Clicking the space rocket icon in Theme Manager fixed the problem.

In another site, I’m not sure what the solution is. Again the custom theme was not applied, but regenerating gave this error message:
image

Under Advanced Variables, I have:
image
(which I had entered when creating the theme originally, using Wappler v3).

I noticed in the other site (where I could fix the theme), also included:

image

… so I added this to the theme, but it didn’t help.

I then deleted all advanced variables, but this results in this:

image

I suppose I could try starting from scratch, but hopefullly there is a way to fix this.

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