Hi,
I don't think it has anything to do with an incompatibility between HikaShop and PageBuilder.
On my own test website on my local computer, I have both installed and running and don't have the error when editing or creating pages.
Based on the screenshot you provided of the callstack and the error message, it seems that you've uninstalled the HikaShop cart notification plugin which comes with HikaShop. However, when the "Load HikaShop on all pages" setting of the HikaShop User Synchronization plugin is activated, HikaShop will try to load that cart notification plugin after loading HikaShop, if HikaShop isn't already loaded on the page. And on a PageBuilder page, HikaShop is not already loaded, and thus it goes in there.
But there is a check missing in this code on whether the cart notification plugin can be loaded before calling its onBeforeCompileHead method. So, I've add a check on our end in order to avoid that error.
Download again the install package of HikaShop on our website and install it on yours and you won't get the error.