*Error* loadContext: could not read UT block

Hello,

I'm building context on linux platform but someday i ran into a
mysterious error in Opus complaining about not able to read UT block
when loading the context file into layoutPlus

Could someone help shed some light what could cause a problem like
this.There were one warning and one error like this

*WARNING* (context read): read failure occured
*Error* loadContext: could not read UT block

Thanks in advance!