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Make it writable by changing its permission. on shell
account type chmod 777
PhpMyLibrary/polerio/module/config/conf.php

and chmod 777
PhpMyLibrary/polerio/module/config/worksheets/worksheetname.wkt

in webhosting account, use your ftp client

then right click on that file.

proceed to these folders:

PhpMyLibrary/polerio/module/config/

then right-click conf.php then select, read/write/execute or
make it 777 equivalent.

do it also in worksheet file.

polerio