Validation NullPointerException on Portal

Hi,

I have two inputfields(say A and B) with context type decimal and date.

When I run my WD AP on localhost and input non-validate value in A or B, the WD framework validate A and B automatically.

When I deploy to EP and run as an iView,

If I input non-validation value in A, it comes an NullPointerException.

And if I input non-validate value in B, WD framework validate automatically.

Any idea with the exception?

Please help! Thanks in advance.

Best Regards,

Eason Huang