@Scheunemann If you tried different sliders and none of them does not work, it means the problem is on server side. We contacted with ThemePunch (Revolution Slider authors last week about this issue) and this is what they wrote:
"this is most likely be a problem with the permissions for the www user as the user is not allowed to open/create files on the filesystem"
And because the problem is on your server side, there is nothing what we or plugin's author can do in such case. You should contact with your admin because this could be sorted on server side only.
What you can do to remove this error, is do not select any slider for page what can be done under Page options section where drop-down Revolution Slider field is.
@beefcakee Did you read what we wrote above? If you tried different slides and none of them works, it means that the problem is related with permissions on your server side and only your admin would be able to help you. Please notice that there is nothing what we our ThemePunch (plugin's author) can do to help you.
I had the same problem and it was solved when I ceased to use Safari on my mac and used Chrome. Safari unzips files and the zip used by Rev Slider for exporting is different, so when you zip it again and try to upload it does not find the export.txt file because of the different zip format. However, if you are using a browser other than Safari, then I don't know what the cause could be.
Comments
Maybe my solution will help somebody.
If the server is using Apache, folders "wp-content" and "uploads" should be set to the owner of the "apache".
Thanks for help
'Error: slider_export.txt does not exist!'
Please post a method to get your demos imported without getting that lousy Error: slider_export.txt does not exist!
"this is most likely be a problem with the permissions for the www user as the user is not allowed to open/create files on the filesystem"
And because the problem is on your server side, there is nothing what we or plugin's author can do in such case. You should contact with your admin because this could be sorted on server side only.
What you can do to remove this error, is do not select any slider for page what can be done under Page options section where drop-down Revolution Slider field is.