WP All Import – Import any XML or CSV File

Please update WP All Import – Import any XML or CSV File from 4.8.6 to 4.8.7. @Steve

WP All Import – Import any XML or CSV File has been updated to 4.8.8-beta-1.0. You can download this version from here.

I installed the latest version, then have the fatal error problem during the process of importing.

I uninstalled this pro version, then installed its free version from wp download, and this fatal error is still there. but if i installed free version first, to run importing, this fatal error doesnt exist.

Any idea of how to fix this?
thanks in advance