That's because the Modelica specification did not say which parameter expressions are valid as array dimensions (and not all of them are allowed). Use constant expressions instead of parameter expressions if you want less problems.

thank you so much, but can i resolve with initial conditions? for example for arrary A[m]  (start m=3) ?
 

If m is a constant, you can use it to declare an array of size m. Start-values has nothing to do with this. A can be modified in any way you like as long as m is a constant expression (and in some cases parameter expression).