update

src/utils.jl

@@ -817,10 +817,13 @@ function replaceHeaders(text::T, headers, step::Int) where {T<:AbstractString}
     header = i[1:end-1]  # not include ":"
     if occursin(header, newtext)
       startind = findfirst(header, newtext)[1]
-      stopind = findnext(":", newtext, startind+1)[end] #BUG MethodError: no method matching lastindex(::Nothing)
+      stopind = findnext(":", newtext, startind+1)[end]
       word = newtext[startind: stopind]
       newword = "$header $step:"
       newtext = replace(newtext, word=> newword)
+      if header == "Thought:"
+        error(1)
+      end
     end
   end