diff --git a/scripts/run_waterkit.py b/scripts/run_waterkit.py
index eced99d..4f68bc4 100644
--- a/scripts/run_waterkit.py
+++ b/scripts/run_waterkit.py
@@ -55,7 +55,7 @@ def main():
     temperature = args.temperature
     output_dir = args.output_dir
     spherical_water_maps = args.spherical_water_maps
-    autogrid_exec_path = args.autogrid_exec_path
+    autogrid_exec_path = os.path.abspath(args.autogrid_exec_path)
     water_model = 'tip3p'
 
     # Force to use only one thread per job
diff --git a/waterkit/utils.py b/waterkit/utils.py
index 2ac6689..e74d1bc 100644
--- a/waterkit/utils.py
+++ b/waterkit/utils.py
@@ -342,7 +342,7 @@ def is_writable(pathname):
         testfile = tempfile.NamedTemporaryFile(dir=pathname)
         testfile.close()
     except (PermissionError, FileNotFoundError) as e:
-        raise RuntimeError('Can write in directory %s.' % pathname) from e
+        raise RuntimeError('Can\'t write in directory %s.' % pathname) from e
 
 
 def execute_command(cmd_line):