Error generating FishEye backup on Windows

I have a FishEye 2.4.4 fresh install.
When generating a backup through the user interface, the follwing error is displayed:

This message is displayed on the fisheye-error.log file:

2011-01-18 16:41:03,481 WARN  [ThreadPool1 ] fisheye.app com.atlassian.crucible.migration.item.FileSaver-add - Skipping C:\Atlassian\fecru-2.4.4\bin\..\data\plugins\data: not found.

Regardless of the error, the backup file is generated inside the backup directory.

Best regards,
Felipe Kraemer
Atlassian Support