Settings not loading and form not visible on website after update from 4.0.9 to

code: "ERR_BAD_REQUEST"

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config: Object { timeout: 0, xsrfCookieName: "XSRF-TOKEN", xsrfHeaderName: "X-XSRF-TOKEN", … }

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message: "Request failed with status code 404"

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name: "AxiosError"

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request: XMLHttpRequest { readyState: 4, timeout: 0, withCredentials: false, … }

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response: Object { data: '<!DOCTYPE html>\n<html lang="en">\n<head>\n <meta charset="utf-8" />\n <meta name="viewport" content="width=device-width, initial-scale=1.0">\n <meta http-equiv="cache-control" content="no-store,max-age=0" />\n <meta name="robots" content="noindex" />\n <title>404 - Not found</title>\n <link href="https://fonts.googleapis.com/css?family=Open+Sans:400,700%7CRoboto:400,700" rel="stylesheet">\n<style>\n * {\n box-sizing: border-box;\n -moz-box-sizing: border-box;\n -webkit-tap-highlight-color: transparent;\n }\n body {\n margin: 0;\n padding: 0;\n height: 100%;\n -webkit-text-size-adjust: 100%;\n }\n .fit-wide {\n position: relative;\n overflow: hidden;\n max-width: 1240px;\n margin: 0 auto;\n padding-top: 60px;\n padding-bottom: 60px;\n padding-left: 20px;\n padding-right: 20px;\n }\n .background-wrap { position: relative; }\n .background-wrap.cloud-blue { background-color: …', status: 404, statusText: "", … }

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stack: "Le@https://www.****/wp-content/plugins/woocommerce-catalog-enquiry/build/index.js?ver=1.0.0:1:24558\n752/Et</</p/<@https://www.2dehandsramen.be/wp-content/plugins/woocommerce-catalog-enquiry/build/index.js?ver=1.0.0:1:38532\np@https://www.2dehandsramen.be/wp-content/plugins/woocommerce-catalog-enquiry/build/index.js?ver=1.0.0:1:38680\n"

​<prototype>: Object { constructor: Le(e, t, n, r, o), toJSON: toJSON(), stack: "", … }