Hi, can you please generate debug report from HMWP Start Tab and post it here as private reply? And which page can I see the above error?
Is this error only when HMWP is active? If so, can you please try emptying out “Ajax URL” field in HMWP Permalinks & Urls tab?
Let us know!
The features marked * are still in experimental mode and might not work in all the site and conditions. So, if you enable such feature, please check the site thoroughly and if causes any issue, disable that option.