LESS Parser fatal error: .box-shadow in Joomla 3.6

[vitrik]

Hi,
I upgraded from the 3.4 version to the Joomla 3.6. I know the template is compatible with Joomla 3.4, but maybe it's a little thing. Now gives the following error:

LESS Parser fatal error:
.box-shadow is undefined: failed at `.box-shadow(inset 0 0 3px @LightGrey);

in the file override.less on line 13

Is there a way to solve?

Thanks

[vitrik]

I solved by changing all code lines

.box-shadow (inset 0 0 'number of pixel' @color);

with

box-shadow: inset 0 0 'number of pixel' @color;