Sharepoint 2007 workflow WhileActivity

I'm trying to build worflow (on Sharepoint 2007 ) which contains a WhileActivity ,The workflow works successfully without WhileActivity ,When i added WhileActivity to workflow designer , the workflow stops afte开发者_开发问答r InitializeComponent() method.

Is There any idea to solve this issue?

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I found a wrokaround this issue by swicth condition from declarative to code.