jsp-struts-websphere 5.1.1

Hi,
My JSP is not getting compiled in WAS5.1.1.I get the following error:

Could not load TagExtraInfo class org.apache.struts.taglib.bean.SizeTei: org.apache.struts.taglib.bean.SizeTei.
.
I have my jsp in war which also has all the struts libraries,web.xml and config.xml
Any help is appreciated.

Thank you.