diff --git a/corrlib/toml.py b/corrlib/toml.py
index 0d4dfc8..29d7de2 100644
--- a/corrlib/toml.py
+++ b/corrlib/toml.py
@@ -158,6 +158,10 @@ def import_toml(path: Path, file: str, copy_file: bool=True) -> None:
     copy_file: bool, optional
         Whether the toml-files will be copied into the library. Default is True.
     """
+    if not os.path.exists(path):
+        raise FileNotFoundError(f"Corrlib path {path} does not exist.")
+    if not os.path.exists(file):
+        raise FileNotFoundError(f".toml-file {file} does not exist.")
     print("Import project as decribed in " + file)
     with open(file, 'rb') as fp:
         toml_dict = toml.load(fp)
diff --git a/corrlib/tools.py b/corrlib/tools.py
index 93f0678..e75e1cc 100644
--- a/corrlib/tools.py
+++ b/corrlib/tools.py
@@ -89,7 +89,7 @@ def set_config(path: Path, section: str, option: str, value: Any) -> None:
     value: Any
         The value we set the option to.
     """
-    config_path = os.path.join(path, CONFIG_FILENAME)
+    config_path = path / CONFIG_FILENAME
     config = ConfigParser()
     if os.path.exists(config_path):
         config.read(config_path)
@@ -115,7 +115,9 @@ def get_db_file(path: Path) -> Path:
     db_file: str
         The file holding the database.
     """
-    config_path = os.path.join(path, CONFIG_FILENAME)
+    if not os.path.exists(path):
+        raise FileNotFoundError(f"Corrlib path {path} does not exist.")
+    config_path = path / CONFIG_FILENAME
     config = ConfigParser()
     if os.path.exists(config_path):
         config.read(config_path)
@@ -140,7 +142,7 @@ def cache_enabled(path: Path) -> bool:
     cached_bool: bool
         Whether the given library is cached.
     """
-    config_path = os.path.join(path, CONFIG_FILENAME)
+    config_path = path / CONFIG_FILENAME
     config = ConfigParser()
     if os.path.exists(config_path):
         config.read(config_path)
diff --git a/corrlib/tracker.py b/corrlib/tracker.py
index 1bae1b4..98fdec5 100644
--- a/corrlib/tracker.py
+++ b/corrlib/tracker.py
@@ -21,7 +21,7 @@ def get_tracker(path: Path) -> str:
     tracker: str
         The tracker used in the dataset.
     """
-    config_path = os.path.join(path, CONFIG_FILENAME)
+    config_path = path / CONFIG_FILENAME
     config = ConfigParser()
     if os.path.exists(config_path):
         config.read(config_path)