Fix call

Author: adeas31

OMPython/ModelicaSystem.py

@@ -1021,7 +1021,7 @@ def getOptimizationOptions(
 
         raise ModelicaSystemError("Unhandled input for getOptimizationOptions()")
 
-    def parse_om_version(version: str) -> tuple[int, int, int]:
+    def parse_om_version(self, version: str) -> tuple[int, int, int]:
         match = re.search(r"v?(\d+)\.(\d+)\.(\d+)", version)
         if not match:
             raise ValueError(f"Version not found in: {version}")