importing with import Modelica.Math.Matrices; the library I'm getting in OMN the following failure response

record SimulationResult
    resultFile = "",
    messages = "Failed to build model: StabilizedPendulum"
end SimulationResult;
OMC-ERROR:
"[<interactive>:21:5-21:38:writable] Error: Klasse Matrices.inv konnte nicht im Geltungsbereich von StabilizedPendulum (looking for a function or record) gefunden werden.
Error: Error occurred while flattening model StabilizedPendulum
"