JCaptcha integration

[ub_old]

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Hi all.

I found Jcaptcha integration manual from http://www.ja-sig.org/wiki/display/CASUM/JCAPTCHA+integration+with+CAS and I do like this. But if first time user input invalid captcha text, second time who input valid text then  "org.springframework.webflow.execution.repository.NoSuchFlowExecutionException" exception throws. 

How can i fix this.

Uuganbold
Cas newbie user.