I believe that your command is incorrect. See the binding doc:
If you have properly defined the telegram thing then you don’t need anything in the sendTelegramPhoto call except for the URL of the image. If you are trying to send this to a different chat than the default chat defined for your bot, the first parameter in sendTelegramPhoto must be a telegram chat ID which must be passed as a long type.
Right now, because you have a string (“MyBot”) as the first parameter, that’s what the binding is using as the image location and, for obvious reasons, can’t find anything there.