[vtkusers] VRMLimpoter parse error when using vtkMultiProcessController?

[陈皓]

i imported many VRML files using vtkMultiProcessController,there are two thread in my program,task1 import files from 1.wrl to 10.wrl,task2 import files from 11.wrl to 20.wrl.
using vtkInputPort(taks1) and vtkOutputPort(task2) to communicate between the two tasks.
but when running the program,errors occurs,like
"fatal flex scanner internal error--end of buffer missed"
"Error near line 7: Error near line 7: parse error"
or
"Error near line 683: Unknown node type 'Viewpoint'"
....

if i do not import any vrml file in task1,only import files in task2,there is no error!

any one can help me?thanks!