fix(leanpkg): fix error message
fix(leanpkg): fix error message

fpvandoorn/lean,dselsam/lean,dselsam/lean,Kha/lean,leanprover-community/lean,leanprover/lean,digama0/lean,digama0/lean,fpvandoorn/lean,Kha/lean,dselsam/lean,leodemoura/lean,leanprover/lean,Kha/lean,Kha/lean,dselsam/lean,leanprover-community/lean,leanprover/lean,dselsam/lean,leanprover/lean,leanprover-community/lean,leodemoura/lean,leodemoura/lean,leodemoura/lean,leodemoura/lean,leanprover/lean,leodemoura/lean,leanprover-community/lean,fpvandoorn/lean,digama0/lean,fpvandoorn/lean,digama0/lean,Kha/lean,dselsam/lean,leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,Kha/lean,leanprover-community/lean,digama0/lean,digama0/lean,leanprover/lean