Thanks, I was fixed this problem.

Hello @foomagoo

I fix some code of the “Uninstall.php”

Step 1:

Change
$wpdb->query(“DROP TABLE IF EXISTS “.$wpdb->prefix.'”FC_captcha_store”);
To
$wpdb->query(“DROP TABLE IF EXISTS “.$wpdb->prefix.”FC_captcha_store”);

Step 2:

Add Code:
require_once(WP_PLUGIN_DIR . “/” . plugin_basename(dirname(__FILE__)) . “/lib/FlexibleCaptcha.class.php”);
$Captcha_fontDirectory = new FlexibleCaptcha(__FILE__);

Change

if (is_array(get_option(‘FC_uploaded_fonts’))) {
foreach(get_option(‘FC_uploaded_fonts’) as $fontFile) {
if (file_exists($this->fontDirectory . $fontFile)) {
@unlink($this->fontDirectory . $fontFile);
}
}
delete_option(‘FC_uploaded_fonts’);
}

if (file_exists($this->fontDirectory)) {
@unlink($this->fontDirectory);
}

To

if (is_array(get_option(‘FC_uploaded_fonts’))) {
foreach(get_option(‘FC_uploaded_fonts’) as $fontFile) {
if (file_exists($Captcha_fontDirectory->fontDirectory . $fontFile)) {
@unlink($Captcha_fontDirectory->fontDirectory . $fontFile);
}
}
delete_option(‘FC_uploaded_fonts’);
}

if (file_exists($Captcha_fontDirectory->fontDirectory)) {
@unlink($Captcha_fontDirectory->fontDirectory);
}