I want to export my widget settings from an Online-Server into my local environment. The export works fine. The JSON-File isn't empty. However everytime I try to import the JSON-File/click on the "Show Widget Settings", I get the error message "Warning: file_get_contents() [function.file-get-contents]: Filename cannot be empty in [...]\wp-content\plugins\widget-settings-importexport\widget_data.php on line 373". After that I get the buttons Select/Un-Select All Widgets but there is no content.
Any idea where the problem could be?