datlechin After checking with composer why symfony/dom-crawler
, I found out that the katosdev/signature v1.2 is using symfony/dom-crawler v6.0.9. As I don't use the katosdev/signature anymore, so I removed it then downgraded the version of symfony/dom-crawler to v5.0. After of these things, I can install your extension smoothly.
Thank you for your reply and all your hardwords.