chat.postMessage checkResponse() failed "invalid_arguments"

[LinuxRocks2000]

Why is this error happening? Do I need to add something else?
My code:

#include <slacking/slacking.hpp>
#define TEST
#include "secret.h"

int main(){
    auto& slack = slack::create(SECRET);
    slack.chat.channel="#general";
    slack.chat.postMessage("Ding dong man, ding dong. Ding dong, yo, ding dong.");
    return 0;
}

[avpcan]

I was getting this, too. I tried editing the slacking.hpp to be in verbose mode and found that this is the error:
{"deprecated_argument":"as_user","error":"invalid_arguments","ok":false}

The error is because slack deprecated the use of as_user for chat.postMessage for new slack apps.

In my case, I actually wanted to use webhooks ( Here's how to set up a webhook )
With webhooks, this is the example to base your code on, and this approach is working for me.

[coin-au-carre]

Hello, thanks for the issue and the workaround.
I will try to work on an update for Slacking :).

[coin-au-carre]

This PR should fix the issue and you will be able to use postMessage as before !

#12

Indeed, the "as_user" is now deprecated, I just removed it from slacking.hpp.

[coin-au-carre]

And sorry for the late reply guys!