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DefiniteIntegrate Question, noopen



Mathematica Enhanced Version 2.2 (running Windows 3.1) Kernel Version
2.2
Build Number: Alpha 2.2.1.981


Why do I get the Message "Get::noopen: Can't open
Integrate`DefiniteIntegrate`." and what does it mean?

Input:
InputForm[
Integrate[(Ms/Pi)*(2*a2^2*x)*ArcTan[t/(2*(xx-x))], {x,-(w/2),(w/2)}]+
Integrate[(Ms/Pi)*(3*a3^3*x^2)*ArcTan[t/(2*(xx-x))], {x,-(w/2),(w/2)}]+
Integrate[(Ms/Pi)*(4*a4^4*x^3)*ArcTan[t/(2*(xx-x))], {x,-(w/2),(w/2)}]+
Integrate[(Ms/Pi)*(5*a5^5*x^4)*ArcTan[t/(2*(xx-x))], {x,-(w/2),(w/2)}]+
Integrate[(Ms/Pi)*(6*a6^6*x^5)*ArcTan[t/(2*(xx-x))], {x,-(w/2),(w/2)}]]


Message:
Get::noopen: Can't open Integrate`DefiniteIntegrate`.

Output:
(-(7.500000000000001*10^-6)*a2^2)/Pi^2 + (0.*a3^3)/Pi^2 -
(2.5*10^-12*a4^4)/Pi^2 + (0.*a5^5)/Pi^2 -
  (1.5*10^-18*a6^6)/Pi^2 - (0.000015*a3^3*xx)/Pi^2 + (0.*a4^4*xx)/Pi^2 -
(5.000000000000001*10^-12*a5^5*xx)/Pi^2 +
  (0.*a6^6*xx)/Pi^2 + ...

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