Hi denkal,
That sounds like not all the plugin files downloaded properly. Try deleting the plugin and downloading it fresh. Then try activating it again.
Hi.
@dental, did you solve this problem?
I have the same problem and I tried to downgrade the php version from 7.0 to 5.6.
With php 5.6 it works fine.
If this problem is with php version, please, consider to update the plugin.
Regards…
Hi Oscar,
While an issue like this is usually caused by an incomplete plugin download (e.g. when updating), we did actually just put out a new version of the plugin a short while ago that includes updated PHPExcel files for better compatibility. Please update to the latest version to insure that you have all the files (i.e. not an incomplete download) and the latest PHPExcel files.