"ghc --make site.hs" encounter error

[luckypoem]

root@AR:/usr/local/CompanyCampus-blog# ghc --make site.hs
[1 of 1] Compiling Main ( site.hs, site.o )

site.hs:135:29: error:
• Couldn't match type ‘unordered-containers-0.2.7.1:Data.HashMap.Base.HashMap
Data.Text.Internal.Text
aeson-0.11.2.1:Data.Aeson.Types.Internal.Value’
with ‘M.Map String (Compiler ContextField)’
Expected type: M.Map String (Compiler ContextField)

    Actual type: Metadata
• In the first argument of ‘makeMetadataContext’, namely ‘m’
  In the second argument of ‘mappend’, namely ‘makeMetadataContext m’
  In the expression:
    makeUrlField i `mappend` dateField "date" "%B %e, %Y"
    `mappend` makeMetadataContext m

root@AR:/usr/local/CompanyCampus-blog#

how to fix it?
thank you very much!