in excel 2013 added Vlookup function with trim

=IFERROR(VLOOKUP(TRIM(B97),Pivot1500!$A$4:$D$14,3,FALSE),"") on rows

when I try to add these rows getting this error msg

#value , why its not giving me the total of all these rows of value
below is rows trying to add

is there some thing else I need to add to get the total of these rows.

=+E91+E92+E93+E94+E95+E96+E97+E98+E99+E100+E101+E102

can some one please help ,

I know its simple solution, because I am using Vlookup with trim that's why its not working

thanks in advance