Yii 2 giving an exception when clicking on the default contact tab

As suggested in the comments.

The contact form contains a .png picture in the form of a captcha image. The captcha image is used there to prevent spam being send via the contact form.

• You can edit the view page and remove the captcha
• You can install php-gd or php-imagick extension

For solve problem, first install php-gd module on your system. After that open php.ini on your editor and search for ;extension=gd.so and remove the heading ; sign. Then restart your apache service ;).

For Arch Linux you can do followings (Lines that begins with # are command of terminal):

• # pacman -S php-gd
• # vim /etc/php/php.ini
• Press / and type gd then press Enter
• Find ;extension=gd.so and convert it into extension=gd.so by moving cursor on ; sign and press x
• Press Esc and type :wq and press Enter
• # systemctl restart httpd.service

With this two lines it is okeyokay:

sudo apt install php-gd

sudo service apache2 restart