Error: More than one protection modifier

I have two abstract classes in a project (absA and absB).  I have two
derived classes from absA (absADerived1, absADerived2) and two from absB
(absBDerived1, absBDerived2).

In a class that uses objects of all 4 derived types, I have two methods; the
first (methA) takes an object of type absA and the second (methB) of type
absB.

When I want to call methA, I do so with something like...

absADerived1 = new absADerived1();
methA( (absA) absADerived1);

This 'cast' seems to work fine.

However, when I am trying to do the same thing with methB, ie...

absBDerived1 = new absBDerived1();
methB( (absB) absBDerived1);

I am getting the error shown in the subject of this email in class absB (on
a constructor if that helps at all).

the abstract classes absA and absB are virtually identical and there is not
more than one protection modifier.  I figure the real error is something
else but I can't anything in MSDN on it.  Anyone know what might cause this
problem?

Peter

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