My System keeps defaulting back to system messenger

[Android Central Question]

I have installed several SMS apps to try to get the best one for me when it is set to default and I compose a new message I get this message that says it needs to set the system messenger to be able send the message. I can't disable the system messenger

 

[Rukbat]

When you tap OK to that message, that app becomes the default SMS app. You can't run one SMS app when another SMS app is the default.