C# customcontrol fails to compile resx file error

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C#

custom-controls

I have a C# CustomControl that is compiled into my project. I get the error:

"Invalid Resx file. Type GradientOptions, Calculator, Version=1.0.0.0, Culture=neutral, Calculator PublicKeyToken=null in the data at line 167, position 4 cannot be located. Line 169, position 5"

Lines in question are from the form where I have the control added "frmCalculator.resx" and are as follows:

<assembly alias="Calculator" name="Calculator, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
      <data name="btnA.Gradient" type="GradientOptions, Calculator">
        <value>False; Black; Blue; Horizontal</value>
      </data>

How can I get this to get past this error?

Thanks,
Tim

What I have tried:

The only way I can get it to compile is to remove the Custom Control from the form. The Custom Control works elsewhere.