> require(MASS)
> n<- 100000
> n
[1] 1e+05
> w<- rgamma(n,rate=0.5,shape=5);head(w)
[1] 14.135679 18.839336  6.623502 17.165505  2.847572  7.511726
> fit.w<- fitdistr(w,"weibull")
Warning messages:
1: In densfun(x, parm[1], parm[2], ...) : NaNs produced
2: In densfun(x, parm[1], parm[2], ...) : NaNs produced
3: In densfun(x, parm[1], parm[2], ...) : NaNs produced
4: In densfun(x, parm[1], parm[2], ...) : NaNs produced
5: In densfun(x, parm[1], parm[2], ...) : NaNs produced
6: In densfun(x, parm[1], parm[2], ...) : NaNs produced
7: In densfun(x, parm[1], parm[2], ...) : NaNs produced
8: In densfun(x, parm[1], parm[2], ...) : NaNs produced

> summary(fit.w)
         Length Class  Mode
estimate 2      -none- numeric
sd       2      -none- numeric
vcov     4      -none- numeric
loglik   1      -none- numeric
n        1      -none- numeric
>

I do not understand why the summary does not have the fitted parameters.

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