installation.."Bad Request"

The CMS Questions
1

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…

2

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?