These ¡ÈNotice¡É do not have real an incidence. If you have these ¡ÈNotice¡É that indicates that xoops is under version 2.0.14 or superior.
On my web site is good :
http://lipom.org/?caldate=2006-7-31Check that your plug' in is active. Which use you? (and module version)
PS : I think that they is a concern with the file "cache" and "template_c".