Memcache.exe failed to install service or service already installed

I installed xampp on my local computer. The data in the project is stored in memory, but the memcached function did not work on my local machine.

$memcache=memcache_connect('127.0.0.1', 11211); 

Error code:

Fatal error: Call to undefined function memcache_connect() in 

I called the error, but the solutions didn't work for me.

Suggested solutions include the addition of new services

I am getting this error when adding new service "failed to install service or service already installed"

**Windows 7
**Xampp
**Apache/2.4.34 (Win32) OpenSSL/1.0.2o PHP/5.6.38