Webi Errors

Hi,

Can any one give solution's for these errors with exampls..

#CONTEXT

#DATASYNC

#DIV/0

#ERROR

#EXTERNAL

#INCOMPATIBLE

#MIX

#MULTIVALUE

#OVERFLOW

#PARTIALRESULT

#RANK

#RECURSIVE

#REFRESH

#REPFORMULA

#SECURITY

#SYNTAX

#TOREFRESH

#UNAVAILABLE

Regards,

G