WampServer

I have a problem with WAMP.

The icon is green.
Unfortunately I cant run phpmyadmin. the error report is:
phpMyAdmin – Error
The mbstring extension is missing. Please check your PHP configuration.

also, when calling scripts by my virtual host setup I suddenly have the report:
Fatal error: Class 'mysqli' not found in ……

I hope people here can help me out please.
Another thing I would like to know is why this happens; I had WAMP running since July this year and know suddenly (obviously) after programming i have these error reports. What causes this error so sudden, is that due to wrong programming? Can programming switch off / alter the way extensions work or are located?

That I would like to know, but in the first place of course I want to solve the problem of not being able to run phpmyadmin and my virtual host.

Have you tried the solution that was suggested in your previous question

Right-Click Wampmanager tray icon -> Refresh

Question: I suppose you have not put wampserver back onto a FAT formatted disk have you?

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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>
Read The Manuals Apache -- MySQL -- PHP -- phpMyAdmin
Get your Apache/MySQL/mariaDB/PHP ADDONs here from the WAMPServer alternate Repo
-X-X-X- Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-

this worked

thanks a lot for helping me out Riggs, you are great.

Still its strange to me this happens; can it be due to what I wondered in the opening post?

Well I can only think that you were making some changes to WAMPServer and something went wrong.

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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>
Read The Manuals Apache -- MySQL -- PHP -- phpMyAdmin
Get your Apache/MySQL/mariaDB/PHP ADDONs here from the WAMPServer alternate Repo
-X-X-X- Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-