My process stops if I write on any attribute of any business data


Hi, I just installed Bonita and tried some starter example (so no changes on general configuration were made). My problem is that every time I try to write some attribute of any business variable is like if the process would stop.
I figured this out because if I try to set some default value in my business data (by editing them in the pool variables panel) the Portal doesn't even start, otherwise if I use a service task to set the attributes by operations and than I connect it to a human task, the process starts but the human task is never detected (like of the process would stop to the first task). So I suppose something goes wrong when I write an attribute in any way and for any object (I've double-checked with object made by the VacationRequest example).
How can I fix that?

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