diff --git a/src/core/input.jl b/src/core/input.jl
index 0efa711ff616797102850f1fc6de33b73d930597..b0a2b99342c1f6030345889a94126bf9b1555b5d 100644
--- a/src/core/input.jl
+++ b/src/core/input.jl
@@ -97,23 +97,19 @@ function preprocessparameters(settings::Dict{String,Any}, defaultoutdir::String)
     end
     # check if input data are present in the working directory or the package directory
     if !isdir(settings["world.mapdirectory"])
-        @warn "$(settings["world.mapdirectory"]) not found in current working directory."
         if isdir(abspath(pkgdir(@__MODULE__), settings["world.mapdirectory"]))
             settings["world.mapdirectory"] = abspath(pkgdir(@__MODULE__), settings["world.mapdirectory"])
-            @warn "Using package directory to load maps: $(settings["world.mapdirectory"])."
-            #@debug "Using package directory to load map data: $(settings["world.mapdirectory"])".
+            @debug "Using package directory to load map data: $(settings["world.mapdirectory"])."
         else
-            @warn "Couldn't find maps at $(settings["world.mapdirectory"])."
-            #Base.error("Couldn't find map directory $(settings["world.mapdirectory"]).") #FIXME
+            Base.error("Couldn't find map directory $(settings["world.mapdirectory"]).")
         end
     end
     if !isdir(settings["crop.cropdirectory"])
         if isdir(abspath(pkgdir(@__MODULE__), settings["crop.cropdirectory"]))
             settings["crop.cropdirectory"] = abspath(pkgdir(@__MODULE__), settings["crop.cropdirectory"])
-            @debug "Using package directory to load crop data: $(settings["crop.cropdirectory"])".
+            @debug "Using package directory to load crop data: $(settings["crop.cropdirectory"])."
         else
-            #Base.error("Couldn't find crop directory $(settings["crop.cropdirectory"]).")
-            @warn "Couldn't find crop directory $(settings["crop.cropdirectory"])."
+            Base.error("Couldn't find crop directory $(settings["crop.cropdirectory"]).")
         end
     end
     # sanity checks