subflow error

im using joget 2.03

i found error (maybe) look like :
this event cause i use subflow on my workflow

the workflow look like this

?

then subflow represent the workflow :
i dont know where the error come, because of the complex of the workflow or i just have made a mistake to set the workflow...

the result of this error, that setting make lopping to create assignment, that i can see in running process,

so how can i fix this.

thankx