Invalid Character Error

"Invalid character error" occurs because an invalid character is used in the file name.

Invalid characters include the following: * \ / } { < > : ' " | % ?
This is not a QlikView and NPrinting limitation, the restriction is in Windows file system. 

Please check that invalid characters are not used in any file name reference.

This error may occurs if you are using the "Custom Folder" option in Task > General.

Is it possible that you enter a value like "FolderName/SubfolderName" in any text boxes?
This is not allowed because the character '/' would be in the file name. You must add a new text box using the green '+' to add the sub-folder to the path.