"Could not find a proper state to initialise" error

[cj...@ucsc.edu]

Dear Remco (and others), 

I am trying to estimate divergence time across my phylogeny using 8 fossil constraints in Beast 2.1.3, but I always end with this error:

java.lang.Exception: Could not find a proper state to initialise. Perhaps try another seed.

at beast.core.MCMC.run(Unknown Source)

at beast.app.BeastMCMC.run(Unknown Source)

at beast.app.beastapp.BeastMain.<init>(Unknown Source)

at beast.app.beastapp.BeastMain.main(Unknown Source)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at apple.launcher.LaunchRunner.run(LaunchRunner.java:116)

at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:51)

at apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52)

Any ideas as why I receive this error? I've attached my xml file if you would like to take a look.

Thanks for your help!

[Remco Bouckaert]

To fix this, set the proportion invariant to a number in between zero and one.

See https://groups.google.com/forum/?fromgroups=#!topic/beast-users/pLvauCDhwSM

Remco