Perhaps the most important issue to note , about complex templates , is the fact that the markup language is very reliable for complex template coding , even with complex calculations , so most template problems are often caused by obscure coding errors , rather than by bugs inside the MediaWiki software . Perhaps the most important issue to note , about complex templates , is the fact that the markup language is very reliable for complex template coding , even with intricate calculations , so most template problems are often caused by obscure coding errors , rather than by bugs inside the MediaWiki software .