Wampserver.lib.php error (no replies)

Hello

I have problem with latest wampserver, Aestan Tray Menu
When i won to change the version of php or apache or just empt logs i get this errro in php logs

PHP Fatal error: Uncaught Error: Call to undefined function proc_open() in C:\wamp64\scripts\wampserver.lib.php:1209
Stack trace:
#0 C:\wamp64\scripts\wampserver.lib.php(507): proc_open_output()
#1 C:\wamp64\scripts\refreshVerifyFiles.php(265): retrieve_apache_define()
#2 C:\wamp64\scripts\refresh.php(50): require('...')
#3 {main}
thrown in C:\wamp64\scripts\wampserver.lib.php on line 1209

if anybody have idea what is wrong, please let me know

thanks