The problem is caused by some fubar code in BPS 3.0 that will be fixed in BPS 3.1 > https://wordpress.org/support/topic/problems-with-the-subscribe-to-comments-reloaded-plugin/#post-10382282. This problem/error is only caused if you have the Subscribe To Comments Reloaded plugin installed. You can make this manual code edit below to fix the problem now. Change the code highlighted in Yellow as shown below.
File: /bulletproof-security/includes/hud-autofix-whitelist.php
Code Line: 516
Code Mod before:
if ( $sctocr_active == 1 || is_plugin_active_for_network( $sctocr ) ) {
if ( ! preg_match( $marker2, $bps_customcode_bpsqse ) || ! preg_match( $marker3, $bps_customcode_bpsqse ) || ! preg_match( $marker4, $bps_customcode_bpsqse ) ) {
$autofix_message = bpsPro_autofix_message($autofix_message);
$debug_BPSQSE .= __('CC Root Text Box 12: Subscribe To Comments Reloaded Plugin', 'bulletproof-security').'
';
}
}
Code Mod after/fixed:
if ( $sctocr_active == 1 || is_plugin_active_for_network( $sctocr ) ) {
if ( ! preg_match( $marker2, $bps_customcode_bpsqse ) || ! preg_match( $marker3, $bps_customcode_bpsqse ) || ! preg_match( $marker4, $bps_customcode_bpsqse ) ) {
$autofix_message = 1;
$debug_BPSQSE .= __('CC Root Text Box 12: Subscribe To Comments Reloaded Plugin', 'bulletproof-security').'
';
}
}