installation.."Bad Request"

Hi I want to install kirby panel.
I can access installation page, but after I write email and password and proceed installation,
then browser said " Bad Request" and " The JSON response could not be parsed"…
console said : Autofocus processing was blocked because a document already has a focused element.
index.js:1 POST url/api/system/install 400 (Bad Request)
request @ index.js:1
post @ index.js:1
install @ index.js:1
install @ index.js:1
submit @ index.js:1
dn @ vue.js:11
r @ vue.js:11
i._wrapper @ vue.js:11
index.js:1 The JSON response could not be parsed
fatal @ index.js:1
(anonymous) @ vendor.js:6
pl.dispatch @ vendor.js:6
dispatch @ vendor.js:6
onParserError @ index.js:1
(anonymous) @ index.js:1
await in (anonymous) (async)
request @ index.js:1
await in request (async)
post @ index.js:1
install @ index.js:1
install @ index.js:1
submit @ index.js:1
dn @ vue.js:11
r @ vue.js:11
i._wrapper @ vue.js:11
index.js:1

400 Bad Request

Bad Request

Your browser sent a request that this server could not understand.

index.js:1 false

I can only use php 8.0… anyone can fix my problem…?
thank you very much…

What about the network tab?

Also, I’m missing some information like your Kirby version.

Is this on a remote server or locally? A fresh Starterkit or your own project?