There’s nothing that can be done, but there might be some thins that you can do to help get the message through.
Firstly, what error message did you receive? Someone else may have had it and know how to get around it.
Secondly, in general I would recommend never using BBCode (formatting tags) in PMs or indeed in posts if possible. If you have these, such as for quotes, then remove them. Likewise, sending links can be difficult.