Typical reasons for errors occurring whilst trying to send bitcoin are as follows:
- A space accidentally inserted before or after the recipients wallet address
- Not stating decimal point correctly
- Insufficient bitcoin in your wallet
- Invalid recipient bitcoin wallet address, wallet addresses can be checked by entering them into the search field at a block search engine
If none of the above helps, then please email firstname.lastname@example.org with the recipients bitcoin wallet address (so we can easily copy and paste), along with a screenshot of the completed Send page.