Error Messages on Stacks

I’m running RapidWeaver 8 on Catalina, and have recently installed Stacks, Foundry 2 and Carpenter. I’ve been testing to some templates, and am getting consistent error messages of the type attached here. I checked with Foundry, which advised me that this was a “RW bug” with a stack. It seems to stop me previewing some pages. Any advice would be appreciated (I’m new to using Stacks and Foundry). Thanks. Gary Screenshot 2020-08-22 at 21.42.18|690x431

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