Failed to load resource: the server responded with a status of 404 (Not Found)

Dear PhastPress

The support from Kadenze pointet out that my resent installed PhastPress, is giving some 404 error.
The Google PageSpeed Insights is also showing that there is a 404 error as a result of PhastPress.
I dont know if there is a gereral problem, or others are having this issues.

This is what I got from Kadence support.

JjPWh0dHBzJTNBJTJGJTJGZm9udHMuZ29vZ2xlYXBpcy5jb20lMkZjc3MlM0ZmYW1pbHklM0RMYXRvJTNBcmVndWxhciUyQzcwMCUyNTdDT3N3YWxkJTNBcmVndWxhciUyNmRpc3BsYXklM0Rzd2FwJmNhY2hlTWFya2VyPTFiMTk1MjYzODgxODNiZTVjN2JiZmM0NDk3MzE5ZDNmLTIzMzYxMSZ0b2tlbj1mMjVjOTI4NWU3ZjIyMTk0.q.js:1
Failed to load resource: the server responded with a status of 404 ()

/wp-content/plugins/phastpress/phast.php/c2VydmljZT1idW5kbGVyJnI9RVBZN0k1/a2NYWFEmcj1MZXREYnJpMjBQRSZyPVBlSzQ2SnNGOWVzJnI9U18yVlJrUThrY2Mmcj1WWnBudDIwSlA1ZyZyPVctOFh5RmFoM2ZzJnI9Xy1uQkdJZ1RNRGMmcj1lMl9USHo2VWE4cyZyPWxvQ2RwTlNWaTR3JnI9bzhud1ZydzFMOUEmcj10MGp0clhDWmpzRSZyPXZWSEY5RUxadm4wJnI9eTlkT0NFeXlyMjQmcj16WXFOUG1TSWI4MA.q.js:1
Failed to load resource: the server responded with a status of 404 ()

JjPWh0dHBzJTNBJTJGJTJGZm9udHMuZ29vZ2xlYXBpcy5jb20lMkZjc3MlM0ZmYW1pbHklM0RMYXRvJTNBcmVndWxhciUyQzcwMCUyNTdDT3N3YWxkJTNBcmVndWxhciUyNmRpc3BsYXklM0Rzd2FwJmNhY2hlTWFya2VyPTFiMTk1MjYzODgxODNiZTVjN2JiZmM0NDk3MzE5ZDNmLTIzMzYxMSZ0b2tlbj1mMjVjOTI4NWU3ZjIyMTk0.q.js:1
Failed to load resource: the server responded with a status of 404 ()

Please, can somebody point me in teh right direction?

Thank you very much for any help.
Best regards
Christian

The page I need help with: [log in to see the link]