Namespace dependency not required limma

Question

[Eric Wang]

I want to write an R package and perform some functions in limma package. When I used importFrom limma lmFit

I got the error:

> Namespace dependency not required: ‘limma’.

What's the problem?

[Ram]

Are you using lmFit in the function to whose header this importFrom is added?

[Eric Wang]

Yes，I used devtools package to write my package.