Getting the Omeka encountered an error message

My site www.sag-ufv.ca was working fine last Friday but has suddenly stopped working. Error log shows this:

[02-Oct-2017 18:04:07 UTC] Omeka fatal error: exception ‘Omeka_File_Derivative_Exception’ with message ‘This derivative strategy requires ext/imagick.’ in /home/vatech99/public_html/application/libraries/Omeka/File/Derivative/Strategy/Imagick.php:27
Stack trace:
#0 /home/vatech99/public_html/application/libraries/Omeka/Application/Resource/Filederivatives.php(43): Omeka_File_Derivative_Strategy_Imagick->__construct()
#1 /home/vatech99/public_html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(695): Omeka_Application_Resource_Filederivatives->init()
#2 /home/vatech99/public_html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(638): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource(‘filederivatives’)
#3 /home/vatech99/public_html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(598): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap(NULL)
#4 /home/vatech99/public_html/application/libraries/Zend/Application.php(373): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#5 /home/vatech99/public_html/application/libraries/Omeka/Application.php(49): Zend_Application->bootstrap()
#6 /home/vatech99/public_html/admin/index.php(28): Omeka_Application->initialize()
#7 {main}
[02-Oct-2017 18:07:12 UTC] Omeka fatal error: exception ‘Omeka_File_Derivative_Exception’ with message ‘This derivative strategy requires ext/imagick.’ in /home/vatech99/public_html/application/libraries/Omeka/File/Derivative/Strategy/Imagick.php:u5272:

Im not sure what the issue could be. Any help appreciated!

This message is telling you that you selected the “Imagick” derivative strategy, but you don’t have the imagick PHP extension installed.

If it was working and broke and you didn’t change anything in Omeka, then probably the installation of PHP on the server was updated, and imagick didn’t get reinstalled.

Thanks! Host company fixed it.