ERROR: This page is using an unprefixed version of template {{Documentation}}

Create {{Wb/bcl/Documentation}} instead and replace all occurences of {{Documentation}} in Wb/bcl/ prefixed pages by that.
You may like to check 4 templates in Category:Wb/bcl/Templates using unprefixed template Documentation first to remove all occurences from those templates which will fix the pages containing those templates too.
[create] Template-info.svg Template documentation