'\nolimits is allowed only on operators'  which  render right in mathjax v3 

I render this LaTeX in  https://www.mathjax.org/#demo , nothing is wrong. But when I render with mathjax-node v2.1.1, it report an error '\nolimits is allowed only on operators'. What should I do to solve this problem?


```
\log \nolimits (M\cdot N)=\log_a \nolimits M+ \log \nolimits_aN(a > 0,a \neq 1,M > 0,N > 0
```