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Question on General::nlnum warning when use FindRoot


Hi All,

When I use FindRoot to solve an equation, I always get the warning
General::nlnum. Do you have any idea what this warning refers to? The
mathematical help says "Notes for this message have not yet been
added." What function I should use to solve that equation numerically?
Thanks!

Best wishes,
Peng

intensity[x_, δ_, p_, λ_] := 1/4 + (2*Cos[(Pi*x)/100])/Pi +
(4*Cos[(Pi*x)/100]^2)/Pi^2 - (2*Cos[(3*Pi*x)/100])/(3*Pi) -
 (8*Cos[(Pi*x)/100]*Cos[(3*Pi*x)/100])/(3*Pi^2) +
(4*Cos[(3*Pi*x)/100]^2)/(9*Pi^2)

FindRoot[intensity[50, δ, 200, 50] == 0.3*(1/4 + 32/(9*Pi^2) +
(4*Sqrt[2])/(3*Pi))*1.1, {δ, 1}]


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