Image thumbnails don't resize, page also throws errors

[Peazyyy]

I'll just show a screenshot for explanation.

[Peazyyy]

Opening this page also throws these errors

Core: Error handler (BE): PHP Warning: Declaration of
Tx_Yag_ViewHelpers_Uri_GalleryViewHelper::render($galleryUid = NULL, ?Tx_Yag_Domain_Model_Gallery $gallery = NULL, $pageUid = NULL, $pageType = 0, $noCache = false, $noCacheHash = false, $section = '', $format = '') 
should be compatible with 
Tx_PtExtlist_ViewHelpers_Uri_ActionViewHelper::render($action = NULL, array $arguments = Array, $controller = NULL, $extensionName = NULL, $pluginName = NULL, $pageUid = NULL, $pageType = 0, $noCache = false, $noCacheHash = false, $section = '', $format = '', $linkAccessRestrictedPages = false, array $additionalParams = Array, $absolute = false, $addQueryString = false, array $argumentsToBeExcludedFromQueryString = Array) 
in C:\xampp\htdocs\MWA\typo3conf\ext\yag\Classes\ViewHelpers\Uri\GalleryViewHelper.php line 34

Core: Error handler (BE): PHP Warning: Declaration of 
Tx_Yag_ViewHelpers_Link_GalleryViewHelper::render($galleryUid = NULL, ?Tx_Yag_Domain_Model_Gallery $gallery = NULL, $pageUid = NULL, $pageType = 0, $noCache = false, $noCacheHash = false, $section = '', $format = '') 
should be compatible with 
Tx_PtExtlist_ViewHelpers_Link_ActionViewHelper::render($action = NULL, array $arguments = Array, $controller = NULL, $extensionName = NULL, $pluginName = NULL, $pageUid = NULL, $pageType = 0, $noCache = false, $noCacheHash = false, $section = '', $format = '', $linkAccessRestrictedPages = false, array $additionalParams = Array, $absolute = false, $addQueryString = false, array $argumentsToBeExcludedFromQueryString = Array) 
in C:\xampp\htdocs\MWA\typo3conf\ext\yag\Classes\ViewHelpers\Link\GalleryViewHelper.php line 32

[Peazyyy]

Well my bad, I didn't have Graphics Magick set up properly.

Thumbnail resizing works properly now. The error messages persist though.