XF 1.5 Add-On Error, Can't Install Anything (pics)

Hey I've been trying to install new-add on's and have been getting this error message. As soon as I choose the file and hit the install button it takes me to this page, an I have the following error




XenForo moderator
Staff member
Is that error in the log being triggered when you attempt to install?

If so, you would need to contact the author of the xfa slider add-on for troubleshooting and support.