another solution
Replace line 89 in /lib/Controller/Font.php
‘validExt’ => implode(‘|’, $this->getValidExtensions()
by
‘validExt’ => implode(‘|’, $this->fontFactory->getValidExtensions()
another solution
Replace line 89 in /lib/Controller/Font.php
‘validExt’ => implode(‘|’, $this->getValidExtensions()
by
‘validExt’ => implode(‘|’, $this->fontFactory->getValidExtensions()