diff --git a/API/Classes/Base/Config.py b/API/Classes/Base/Config.py
index bbbe41ab..3c6e8c21 100644
--- a/API/Classes/Base/Config.py
+++ b/API/Classes/Base/Config.py
@@ -20,24 +20,28 @@
 ALLOWED_EXTENSIONS = set(['zip', 'application/zip'])
 ALLOWED_EXTENSIONS_XLS = set(['xls', 'xlsx'])
 
-UPLOAD_FOLDER = Path('WebAPP')
-WebAPP_PATH = Path('WebAPP')
-DATA_STORAGE = Path("WebAPP", 'DataStorage')
-CLASS_FOLDER = Path("WebAPP", 'Classes')
-EXTRACT_FOLDER = Path("")
-SOLVERs_FOLDER = Path('WebAPP', 'SOLVERs')
-
-
-#absolute paths
-# OSEMOSYS_ROOT = os.path.abspath(os.getcwd())
-# UPLOAD_FOLDER = Path(OSEMOSYS_ROOT, 'WebAPP')
-# WebAPP_PATH = Path(OSEMOSYS_ROOT, 'WebAPP')
-# DATA_STORAGE = Path(OSEMOSYS_ROOT, "WebAPP", 'DataStorage')
-# CLASS_FOLDER = Path(OSEMOSYS_ROOT, "WebAPP", 'Classes')
-# EXTRACT_FOLDER = Path(OSEMOSYS_ROOT, "")
-# SOLVERs_FOLDER = Path(OSEMOSYS_ROOT, 'WebAPP', 'SOLVERs')
-
-os.chmod(DATA_STORAGE, 0o777)
+# ── Absolute paths derived from this file's location ──
+# Config.py lives at API/Classes/Base/Config.py
+# Repository root is 3 levels up: Base/ → Classes/ → API/ → root
+_THIS_DIR = Path(__file__).resolve().parent          # .../API/Classes/Base
+MUIO_ROOT = _THIS_DIR.parent.parent.parent           # .../MUIO  (repo root)
+
+UPLOAD_FOLDER = MUIO_ROOT / 'WebAPP'
+WebAPP_PATH   = MUIO_ROOT / 'WebAPP'
+DATA_STORAGE  = MUIO_ROOT / 'WebAPP' / 'DataStorage'
+CLASS_FOLDER  = MUIO_ROOT / 'WebAPP' / 'Classes'
+EXTRACT_FOLDER = MUIO_ROOT
+SOLVERs_FOLDER = MUIO_ROOT / 'WebAPP' / 'SOLVERs'
+
+# ── Ensure DataStorage directory exists ──
+os.makedirs(DATA_STORAGE, exist_ok=True)
+
+# ── Safe chmod (skip on Windows where octal modes are not supported) ──
+if SYSTEM != 'Windows':
+    try:
+        os.chmod(DATA_STORAGE, 0o777)
+    except OSError:
+        pass  # Non-fatal: permissions may already be sufficient
 
 HEROKU_DEPLOY = 0
 AWS_SYNC = 0
diff --git a/API/Classes/Case/CaseClass.py b/API/Classes/Case/CaseClass.py
index 6230de9b..17b9268f 100644
--- a/API/Classes/Case/CaseClass.py
+++ b/API/Classes/Case/CaseClass.py
@@ -613,8 +613,11 @@ def createCase(self):
         try:
             for group, array in self.PARAMETERS.items():
                 if array:
+                    if group not in Config.DEFAULT_F:
+                        print(f"[WARN] createCase: skipping unknown parameter group '{group}' (not in DEFAULT_F)")
+                        continue
                     func_name = Config.DEFAULT_F[group]
-                    func = getattr(self,func_name) 
+                    func = getattr(self, func_name) 
                     func() 
             
         except(IOError):
diff --git a/API/app.py b/API/app.py
index f2fc8c47..d6ff3a08 100644
--- a/API/app.py
+++ b/API/app.py
@@ -16,12 +16,12 @@
 from Routes.Case.ViewDataRoute import viewdata_api
 from Routes.DataFile.DataFileRoute import datafile_api
 
-#RADI
-template_dir = os.path.abspath('WebAPP')
-static_dir = os.path.abspath('WebAPP')
+# ── Use absolute paths from Config (derived from __file__, CWD-independent) ──
+template_dir = str(Config.WebAPP_PATH)
+static_dir = str(Config.WebAPP_PATH)
 
-# template_dir = Config.WebAPP_PATH.resolve()
-# static_dir = Config.WebAPP_PATH.resolve()
+# template_dir = os.path.abspath('WebAPP')
+# static_dir = os.path.abspath('WebAPP')
 
 # template_dir = os.path.join(sys._MEIPASS, 'WebAPP') 
 # static_dir = os.path.join(sys._MEIPASS, 'WebAPP') 
@@ -39,7 +39,7 @@
 
 print(__name__)
 
-app = Flask(__name__, static_url_path='', static_folder=static_dir,  template_folder=template_dir)
+app = Flask(__name__, static_url_path='', static_folder=static_dir, template_folder=template_dir)
 
 app.permanent_session_lifetime = timedelta(days=5)
 app.config['SECRET_KEY'] = '12345'