I had a similar experience with Bountycaster. It turned out that our frame had too many characters in the placeholder input field, Warpcast is pretty strict (as per spec) on the constraints of the frame. Open up your inspector and look at where the error is coming from
Use the frame validator to see why its not a valid frame: https://warpcast.com/~/developers/frames?url=https%3A%2F%2Fwarpcast.com%2F0xconca.eth%2F0x5319c7b0