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SmartPart unable to added Exception

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I am working on protal site using smartpart version Version 1.2.0.0 Created by: Jan Tielens, then after i create new page and develope new usercontrols to add them to that page, so after replace the dll file in the bin folder and add the new ascx files, all the old smartparts still working correctly, but i cannot anymore add new smartpart to the newly created page ?!!! beside error occured whenever i change and allready added smartparts, so it will not work anymore.
maybe there is some kind of cash, but the strange was when i get back the original dll file instaed of the new old i replace it before,so everything going fine and i could add new smartparts to the new page , but without ability to benefits from my usecontrols i developed...?!!!
 
so any idea what's worng
 
Error message said: "Unable to add selected web part(s).
Smartpast: Exception occurred.( Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION))."

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