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Numerical integration


I got InterpolatingFunction c[k] as a result of numerical integration NDSolve.
Now, I wanted to use c[k] as if it is an ordinary function of k.
I wanted to do numerical integration which looks like as follows:

NDSolve[
{k'[t]==0.715c[k[t]]+1.0685k[t]/w[k[t]]^.6
	   -0.00777091k[t](-1.8+4.2k[t]/w[k[t]]+7.1343c[k[t]]/w[k[t]]^.4)/((0.336k[t]/w[k[t]]-2.22045*10^(-16)c[k[t]]/w[k[t]]^0.4)*w[k[t]]^.6)
	   -0.263685k[t](2.8-4.2k[t]/w[k[t]]-11.0978c[k[t]]/w[k[t]]^.4)*w[k[t]]^.3-0.457928w[k[t]]^.4 /. %,
 k[0]==0.3},k,{t,0,100}]

And I received an error message saying:

Supplied equations are not 



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