Script error at the end of the process

I am trying to move en.askem-eng.com to http://www.askem-eng.com.
I follow your procediment and at the last step I get to this in the wp-copy free window:

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Started wp_deploy
Executing command wp_deploy
Started deployment to http://ftp.askem-eng.com
Creating database backup…
Database backup finished successfully…
Creating files backup archive…
Files backup completed…
Successfully connected to http://ftp.askem-eng.com
Uploading files on the remote server…
Files uploaded, running remote install http://ftp.askem-eng.com
Unknown script error on en.askem-eng.com/wp-copy.php
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What should I do?

Thanks for your help.
Alejandro

https://wordpress.org/plugins/wp-copy-free/