The Polisario Front independence movement has accused Spain of making a grave error when it changed its position and backed Morocco’s autonomy plan for the disputed Western Sahara. Morocco sees the Western Sahara, a former Spanish colony, with rich phosphate resources and access to lucrative Atlantic fishing waters, as an integral part of its territory. The Algeria-backed Polisario separatists took up arms in the 1970s and have continued to demand an independence referendum on the basis of a 1991 deal that included a ceasefire. On Friday, Spanish Foreign Minister Jose Manuel Albares said Moroc…