Apache flask deployment [No module named ._mariadb]

I am deploying my Flask App on Apache server (using WSGI) and i am a bit confused with my venv. If i start my app by hand - i mean with:

flask run or python3 main.py

everything works fine. But when i try to get access through Apache i am getting error while loading modules like:

File /var/www/FlaskApp/venv/lib/python3.8/site-packages/mariadb/__init__.py, line 7
...
from ._mariadb import (

mariadb was installed through pip3 install mariadb and is located inside /var/www/FlaskApp/venv/lib/python3.8/site-packages/mariadb

I do not have any idea why everything works by hand and through Apache it doesn't. I will appreciate any help.

/etc/apache2/sites-available/FlaskApp.conf

<VirtualHost *:80>
        ServerName 10.0.2.6

        WSGIScriptAlias / /var/www/FlaskApp/flaskapp.wsgi       
        <Directory /var/www/FlaskApp/app/>
            Order allow,deny
            Allow from all
        </Directory>

        Alias /static /var/www/FlaskApp/app/static

        <Directory /var/www/FlaskApp/app/static/>
            Order allow,deny
            Allow from all
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        LogLevel warn
        CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

flaskapp.wsgi

#!/var/www/FlaskApp/venv/bin/python3.8
import sys, logging

activate_this = '/var/www/FlaskApp/venv/bin/activate_this.py'
with open(activate_this) as file_:
    exec(file_.read(), dict(__file__=activate_this))

logging.basicConfig(stream=sys.stderr)
sys.path.insert(0,"/var/www/FlaskApp/app")

from main import app as application

Folder structure:

/var/www/FlaskApp/
   - app/
        - main.py (app.run() inside)
        - static/
   - venv/
   - flaskapp.wsgi