[PD] Bad arguments for message 'loadbang' to object? Flext?

[Peter P.]

Hi list,

I am trying to use the ssr-Objects from
https://github.com/SoundScapeRenderer/ssr/tree/master/flext
which are compiled using flext.

When initiating these objects, the Pd console prints 
	Bad arguments for message 'loadbang' to object 'ssr_binaural~'
(or analogous for all other objects in that library)

There is no other object or message connected to the inlet, nor does
this behavior change when pd is started with the -noloadbang option.

Does anyone know what could cause this?

thx
P