This error suddenly proped up from yesterday evening on all my seotoster cpanel installations.
error log file
Zend_Validate_Hostname->isValid('dnalabsuae.com')
#1 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri/Http.php(277): Zend_Uri_Http->validateHost()
#2 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri/Http.php(154): Zend_Uri_Http->valid()
#3 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri.php(143): Zend_Uri_Http->__construct('https', '//dnalabsuae.co...')
#4 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/application/app/Tools/System/Tools.php(85): Zend_Uri::factory(Array)
#5 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/application/app/Tools/System/Tools.php(79): Tools_System_Tools::_proccessUrl('https://dnalabs...')
#6 /home/dnalaham/public_html/dnal in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Validate/Hostname.php on line 1185
[29-Mar-2020 06:30:42 UTC] PHP Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Cache/Backend.php on line 66
[29-Mar-2020 06:30:42 UTC] PHP Warning: count(): Parameter must be an array or an object that implements Countable in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Db/Table/Abstract.php on line 1305
[29-Mar-2020 06:30:42 UTC] PHP Warning: count(): Parameter must be an array or an object that implements Countable in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Db/Table/Abstract.php on line 1305
[29-Mar-2020 06:30:42 UTC] PHP Fatal error: Uncaught Error: Call to undefined function iconv_strlen() in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Validate/Hostname.php:1185
Stack trace:
#0 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri/Http.php(445): Zend_Validate_Hostname->isValid('dnalabsuae.com')
#1 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri/Http.php(277): Zend_Uri_Http->validateHost()
#2 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri/Http.php(154): Zend_Uri_Http->valid()
#3 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Uri.php(143): Zend_Uri_Http->__construct('https', '//dnalabsuae.co...')
#4 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/application/app/Tools/System/Tools.php(85): Zend_Uri::factory(Array)
#5 /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/application/app/Tools/System/Tools.php(79): Tools_System_Tools::_proccessUrl('https://dnalabs...')
#6 /home/dnalaham/public_html/dnal in /home/dnalaham/public_html/dnalabsuae.com/seotoaster_core/library/Zend/Validate/Hostname.php on line 1185