If you are getting the following error when you are trying to preview your Power Grid CSV page, the issue may be that you have non-ASCII characters in your CSV file.
Strip Non-ASCII Characters
If you enable the above setting, then Power Grid will strip all non-ascii characters from the file and you should be able to properly view your CSV file in Rapidweaver. However, most often than not, you will not need to check this setting when you publish. Non-ASCII characters will only not work inside Rapidweaver preview.
Another solution is to remove the non-ASCII characters from your CSV file. However, its understandable that this is not an option for everyone.