error 403 Page Builder 403 – Forbidden: Access is denied. (admin-ajax.php)

Hello

I get error 403 when I try to edit my web page with Visual Editor (see the following pictures) :

1 : https://ibb.co/rx8zSnB
2 : https://ibb.co/pWkxdFv

the log file:

/********************begin********************************/
15924728284529559292 xxx.xxx.xxx.xxx 80 127.0.0.1 80
–0a030000-B–
POST /wp-admin/admin-ajax.php?_panelsnonce=a060958d1e&_fs_blog_admin=true HTTP/1.1
Connection: close
Content-Length: 104
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Accept: text/html, */*; q=0.01
Accept-Encoding: gzip, deflate, br
Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7,ar;q=0.6
Cookie: wordpress_sec_e1769b03582177d5fbfdb9be6e5ebce4=seor%7C1596527708%7CRGUVziLOGQ4HKE9HvYadQbEHPSFfOUG1AyqG1JEt8ml%7C9e0e77659e563b8a4ad50a49274a9d913eae646da5f536330bf7e69caf281960; _ga=GA1.2.464034023.1595922446; wp-settings-1=editor%3Dhtml%26libraryContent%3Dbrowse%26siteorigin_panels_setting_tab%3Dwelcome%26post_dfw%3Doff%26advImgDetails%3Dshow%26hidetb%3D1%26wplink%3D1%26mfold%3Do%26imgsize%3Dlarge%26uploader%3D1; wp-settings-time-1=1596020307; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_e1769b03582177d5fbfdb9be6e5ebce4=seor%7C1596527708%7CRGUVziLOGQ4HKE9HvYadQbEHPSFfOUG1AyqG1JEt8ml%7C550bc76a7b81b260728651a8f407cab018e896eceef44b18485bc3bd4d2f5c97
Host: www.test.dz
Referer: https://www.test.dz/wp-admin/post.php?post=5066&action=edit
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36
x-requested-with: XMLHttpRequest
origin: https://www.test.dz
sec-fetch-site: same-origin
sec-fetch-mode: cors
sec-fetch-dest: empty

–0a030000-F–
HTTP/1.1 500 Internal Server Error

–0a030000-H–
Message: Access denied with code 403 (phase 1). Match of “rx ^%{tx.allowed_request_content_type_charset}$” against “TX:1” required. [file “C:/Program Files (x86)/Plesk/ModSecurity/rules/modsecurity_crs-plesk/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf”] [line “944”] [id “920480”] [msg “Request content type charset is not allowed by policy”] [data “utf-8”] [severity “CRITICAL”] [ver “OWASP_CRS/3.2.0”] [tag “application-multi”] [tag “language-multi”] [tag “platform-multi”] [tag “attack-protocol”] [tag “OWASP_CRS”] [tag “OWASP_CRS/PROTOCOL_VIOLATION/CONTENT_TYPE_CHARSET”] [tag “WASCTC/WASC-20”] [tag “OWASP_TOP_10/A1”] [tag “OWASP_AppSensor/EE2”] [tag “PCI/12.1”]
Action: Intercepted (phase 1)
Apache-Handler: IIS
Stopwatch: 1596443888643582 0 (- – -)
Stopwatch2: 1596443888643582 0; combined=0, p1=0, p2=0, p3=0, p4=0, p5=0, sr=0, sw=0, l=0, gc=0
Producer: ModSecurity for IIS (STABLE)/2.9.2 (http://www.modsecurity.org/); OWASP_CRS/3.2.0.
Server: ModSecurity Standalone
Engine-Mode: “ENABLED”

–0a030000-Z–
/***********************end*****************************/

Ps: i have already disabled all the plugings except “page builder”,and used the default wordpress theme, but the error persists.