Error with forms

[T-bear]

Hi,
When i try working with several forms, i get these errormessages:
1) Unit1.Pas(42,18) Error: Identifier not "TLevel2"
2) Unit1.Pas(42,18) Error: Error in type definition

Here are row 40-44
40) var
41)   Level1: TLevel1;
42)   Level2: TLevel2;
43)   P: integer;
44)   E: array [1..20] of integer;  

The name of my forms are Level1, and level2.
What do i have to do to dont get these errormessages?
Thanks

[Marc]

add the units where these forms are defined to the uses clause of the unit with the errors