i got an error from function cossin$.$ What should i do$?$

Cell In$[36],$ line $4$

$1$ # Sample tests cossim method in the Collaborative class

$3$ sample$\_$cf $=$ Collaborative$($sample$\_$data$)$

$---->4$ sample$\_$cf$.$calc$\_$item$\_$item$\_$similarity$($sample$\_$cf$.$cossim$)$

$5$ sample$\_$yp $=$ sample$\_$f$.$pr$$dict$()$

$6$ sample$\_$rmse $=$ sample$\_$cf$.$rmse$($sample$\_$yp$)$

Cell In$[32],$ line $103,$ in Collaborative.calc$\_$item$\_$item$\_$similarity$($self$,$ simfunction, $*$x$)$

$100$ def calc$\_$item$\_$item$\_$similarity$($self$,$ simfunction, ${?}^{**}x)$:

$101$ # calculate it$$m$-$item similarity using the specified similarity function

$102$ if len$(x)==0$ :

$-->103$ self.sim $=$ simfunction$()$

$104$ else:

$105$ self.sim $=$simfunction$(x[0])$

Cell In$[32],$ line $111,$ in Collaborative.cossim$($self$)$

$109x=$ self.Mr$.$copy$()$

$110$ user$\_$means $=$ np$.$ nanmean $,$ axis $=1$

$-->111x[np.$isnan$(x)]$ np$.$expand$\_$dims$($user$\_$means, axis$=1)$

$112x-=$ np$.$expand$\_$dims$($np$.$nanmean$($X$,$ axis$=1),$ axis$=1)$

$114$ # $2.$ Calculate cosine similarity for all item$-$item pairs

$115$ # Rescale the cosine similarity to be between $0$ and $1$

$116$ # Handle divide by zero warning by filling nan values with appropriate values

TypeError: NumPy boolean array indexing assignment requires a $0$ or $1-$dimensional input, input has $2$ dimensions