Whenever I run SimPhy with the option -st f:1, I get the error message
Improper value sampling the parameter -St, Species tree length. Please, check your sampling settings and try again
I think this may be a bug as when I run SimPhy with say, -st f:1.0000000001 or -st f:0 I don't get the error, and it doesn't seem like there would be any reason sampling from fixed:1 should be an issue anyway. Here's an example command that produces this issue for me.
simphy_mac64 -st f:1.0 -sb f:0.01 -sd f:0.001 -cs 112233 -sp f:10000 -o test -v 1