Dear IQ-TREE team,

I'm using IQ-TREE v2.3.5 to estimate linked exchangeabilities under the C60 profile mixture model following this tutorial. My alignment has 143 taxa and 7,855 sites.

However, the run crashed almost immediately with the following error:

ERROR: modelprotein.cpp:998: virtual void ModelProtein::init(const char*, std::string, StateFreqType, std::string): Assertion `nxs_model' failed.

I've attached the log file and input files.

Thanks!
Mahwash

iqtree-error.zip