It's runtime error. One or more variables in this expression has non-numeric type at the time of execution. Use debugger to see wich one.

>I am getting a "Data type mismatch' error in this line of code and I cannot find the error.
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>m.Node49NetIn = (m.Node25Activation * m.W25_49) + (m.Node26Activation * m.W26_49) + (m.Node27Activation * m.W27_49) + (m.Node28Activation * m.W28_49) + (m.Node29Activation * m.W29_49) + ;
>(m.Node30Activation * m.W30_49) + (m.Node31Activation * m.W31_49) + (m.Node32Activation * m.W32_49) + (m.Node33Activation * m.W33_49) + (m.Node34Activation * m.W34_49) + ;
>(m.Node35Activation * m.W35_49) + (m.Node36Activation * m.W36_49) + (m.Node37Activation * m.W37_49) + (m.Node38Activation * m.W38_49) + (m.Node39Activation * m.W39_49) + ;
>(m.Node40Activation * m.W40_49) + (m.Node41Activation * m.W41_49) + (m.Node42Activation * m.W42_49) + (m.Node43Activation * m.W43_49) + (m.Node44Activation * m.W44_49) + ;
>(m.Node45Activation * m.W45_49) + (m.Node46Activation * m.W46_49) + (m.Node47Activation * m.W47_49) + (m.Node48Activation * m.W48_49)