Test case Failed because of java.lang.noclassdeffoundError:org/openqa/selenium/WebElement

hi,

when i try to run my test case to launch browser i get the below error message but this issue i am not facing when i try to run the application in admin mode. it seems to be some issues related to java but not able to trace out the fix. kindly help me out to fix my problem

Test case Failed because of java.lang.noclassdeffoundError:org/openqa/selenium/WebElement

thanks and regards,
Sujit kumar jain

Same error