Importing from oscommerce 2.2

[dasfizz]

hi

i have tried to import an oscommerce 2.2 shop with the shop importer tool in prestashop 1.4

but i keep getting the below error


Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

and a pop with this text
Technical error
Details: Error Thrown [object XMLHttpRequest]
Text status: error

does anyone know, what the problem could be?