The form was not submitted properly on much form

Hi all,

I have a problem with the form submission and many other form submissions, the form only displays ‘The form was not submitted properly.’ previously almost never experienced this and now very often even almost always. when trying with the same OJS installation file on my Windows 10 PC, this didn’t happen.
my question is, what happened and how to fix it?

best regards,
chuluq

form response
1

network response
2
{ "status":true, "content":"\t\n\t<script type=\"text\/javascript\">\n\t$(function() {\n\t\t\/\/ Attach the form handler.\n\t\t$('#submitStep1Form').pkpHandler('$.pkp.pages.submission.SubmissionStep1FormHandler');\n\t});\n<\/script>\n\n<form class=\"pkp_form\" id=\"submitStep1Form\" method=\"post\" action=\"https:\/\/jurnal.yudharta.ac.id\/v2\/index.php\/KEBANGSAAN\/submission\/saveStep\/1\">\n<input type=\"hidden\" name=\"csrfToken\" value=\"9143391b10204752fff7a1a1cde736bf\">\n\t<input type=\"hidden\" name=\"submissionChecklist\" value=\"1\"\/>\n\n<script>\n\t$(function() {\n\t\t\/\/ Attach the form handler.\n\t\t$('#submitStep1FormNotification').pkpHandler('$.pkp.controllers.NotificationHandler',\n\t\t{\n\t\t\tfetchNotificationUrl: \"https:\\\/\\\/jurnal.yudharta.ac.id\\\/v2\\\/index.php\\\/KEBANGSAAN\\\/notification\\\/fetchNotification\",\nhasSystemNotifications: null\n\t\t});\n\t});\n<\/script>\n<div id=\"submitStep1FormNotification\" class=\"pkp_notification \"><\/div>\n\n<fieldset id=\"submissionStep1\">\n\t\t\n\t\n\n\t\t\t\t\t<input type=\"hidden\"\n\t id=\"locale\"\n\t name=\"locale\"\n\t class=\" required\"\n\t value=\"en_US\"\n\t validation=\"required\" \/>\n\n\t\n\t\t\t\t\t\t\t\t\t\t\t\t<input type=\"hidden\"\n\t id=\"sectionId\"\n\t name=\"sectionId\"\n\t class=\" required\"\n\t value=\"6\"\n\t validation=\"required\" \/>\n\n\n\t\t\t\n\n<div class=\"section section-policy section-id-6 \">\n\t\t\t\t\t<label >Section Policy<\/label>\t\t\t\n\t\t\t\t\n\n\t<\/div>\n\t\t\t\n\n\t\t\t\t\n<div id=\"pkp_submissionChecklist\" class=\"section \">\n\t\t\t\t\t\t\t<span class=\"label\">Submission Requirements<\/span>\t\t<label class=\"description\">You must read and acknowledge that you've completed the requirements below before proceeding.<\/label>\t<ul class=\"checkbox_and_radiobutton\">\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-0\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-0\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tThe submission has not been previously published, nor is it before another journal for consideration (or an explanation has been provided in Comments to the Editor).\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-1\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-1\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tThe submission file is in OpenOffice, Microsoft Word, RTF, or WordPerfect document file format.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-2\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-2\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tWhere available, URLs for the references have been provided.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-3\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-3\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tThe text is single-spaced; uses a 12-point font; employs italics, rather than underlining (except with URL addresses); and all illustrations, figures, and tables are placed within the text at the appropriate points, rather than at the end.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-4\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-4\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tThe text adheres to the stylistic and bibliographic requirements outlined in the <a href=\"http:\/\/jurnal.yudharta.ac.id\/v2\/index.php\/KEBANGSAAN\/about\/submissions#authorGuidelines\" target=\"_new\">Author Guidelines<\/a>, which is found in About the Journal.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"checklist-5\" required=\"1\" value=\"1\" validation=\"required\" name=\"checklist-5\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tIf submitting to a peer-reviewed section of the journal, the instructions in <a href=\"javascript:openHelp('http:\/\/jurnal.yudharta.ac.id\/v2\/index.php\/KEBANGSAAN\/help\/view\/editorial\/topic\/000044')\">Ensuring a Blind Review<\/a> have been followed.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\t\t\n\t<\/ul><\/div>\n\t\n\t\t\n<div class=\"section \">\n\t\t\t\t\t<label for=\"commentsToEditor-5cc2e39f53143\">Comments for the Editor<\/label>\t\t\t\n\t\t\t\t\t<div>\n\t\t\t\t<textarea \n\t\t\tclass=\" richContent\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tname=\"commentsToEditor\"\n\t\t\trows=\"10\"\n\t\t\tcols=\"80\"\n\t\t\tid=\"commentsToEditor-5cc2e39f53143\">&lt;p&gt;test 123 456 789 0&lt;\/p&gt;<\/textarea>\n\t\t\t<span><\/span>\n<\/div>\n\n\t\n\t<\/div>\n\n\t\t\t\t\t\t\t\n<div class=\"section \">\n\t\t\t\t\t\t\t<span class=\"label\">Submit As<span class=\"req\">*<\/span><\/span>\t\t\t<ul class=\"checkbox_and_radiobutton\">\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\tSubmit in any of the following roles if you would like to be able to edit and publish this submission yourself: Manajer Jurnal\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<li>\n\t<label>\n\t<input type=\"radio\" id=\"userGroup257\" name=\"userGroupId\" value=\"257\" class=\"field radio\" checked=\"checked\"\t>\n\t\t\t\t\t\tManajer Jurnal\n\t\t\t\t<\/label>\n<\/li>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<li>\n\t<label>\n\t<input type=\"radio\" id=\"userGroup269\" name=\"userGroupId\" value=\"269\" class=\"field radio\"\t>\n\t\t\t\t\t\t##default.groups.name.author##\n\t\t\t\t<\/label>\n<\/li>\n\n\t\t\t\t\t\t\t\n\t<\/ul><\/div>\n\t\t\t\n\t\t\t\n<div class=\"section \">\n\t\t\t\t\t<label >Acknowledge the copyright statement<\/label>\t\t\t\n\t\t\t\t\t\t\n\t\t\t\n<div class=\"section \">\n\t\t\t<ul class=\"checkbox_and_radiobutton\">\t\t\t\t\t\n\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"copyrightNoticeAgree\" required=\"1\" value=\"1\" validation=\"required\" name=\"copyrightNoticeAgree\" class=\"field checkbox required required\" required aria-required=\"true\"\/>\n\t\t\tYes, I agree to abide by the terms of the copyright statement.\n\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\t\n\t<\/ul><\/div>\n\t\t\n\t<\/div>\n\t\n\t\t\t\t\n<div class=\"section \">\n\t\t\t<ul class=\"checkbox_and_radiobutton\">\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t<li>\n\t\t\t<label>\n\t\t<input type=\"checkbox\" id=\"privacyConsent\" required=\"1\" value=\"1\" validation=\"required\" name=\"privacyConsent\" class=\"field checkbox required required\" checked=\"checked\" required aria-required=\"true\"\/>\n\t\t\t\t\t\tYes, I agree to have my data collected and stored according to the <a href=\"https:\/\/jurnal.yudharta.ac.id\/v2\/index.php\/KEBANGSAAN\/about\/privacy\" target=\"_blank\">privacy statement<\/a>.\n\t\t\t\t\t\t<\/label>\n\t<\/li>\n\n\t\t\n\t<\/ul><\/div>\n\t\n\t\t\n<div class=\"section formButtons form_buttons \">\n\t\t\t\t\t\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t<button class=\"pkp_button submitFormButton\" type=\"submit\" id=\"submitFormButton-5cc2e39f538f2\" >Save and continue<\/button>\n\n\n\t\t<span class=\"pkp_spinner\"><\/span>\n\n\t\t\t\t\t\t\t\t<a href=\"#\" id=\"cancelFormButton-5cc2e39f53a54\" class=\"cancelButton\">Cancel<\/a>\n\t\n\t<\/div>\n\n\n\t<p><span class=\"formRequired\">* Denotes required field<\/span><\/p>\n\n<\/fieldset>\n\n<\/form>\n", "elementId":"0", "events":null }

system that i use
3

error_log
4