Extension "officepack-master" not compliant: Missing function "extension_install_officepack-master" in "/usr/share/ocsinventory-reports/ocsreports/extensions/officepack-master/install.php"!

Hello guys,

I extracted plugin into /usr/share/ocsinventory-reports/ocsreports/extensions  when im loging into ocs under extenension tab im getting this error. Do you know what exactly this is? Im using 2.9 ubuntu-server version. 

ty