Fix Exception message

Author: Rahul Manavalan

src/ErrorHandle.jl

@@ -1,5 +1,5 @@
 function errorhandle(data::Matrix{FT},modes::IT) where {FT,IT}
     @assert size(data,1)>1 "State vector is expected to be vector valued."
     s = size(data,2)
-    @assert (modes>0)&(modes<s) "Number of modes should be [1,$(s)]."
+    @assert (modes>0)&(modes<s) "Number of modes should be in {1,2,...,$(s-1)}."
 end