Error: eCart is only available '.php' files in PHP websites.
I had eCart 4 installed. I removed the extension and installed eCart 5. When I try to use it, it gives me the error message: "eCart is only available '.php' files in PHP websites." I removed the .dat file, I deleted all the WA eCart files that I could find in the system. Restarted. Re-installed the eCart 5 extension. Same error message appears. I got a project that I need to work on ASAP. Please help!