Articleship completion Certificate

I havent received my articleship completion letter yet though one year six month has lapsed since i submitted my form 108 with the institute. Also i checked the following link for my articleship status: [123456 substitued by the membership no of my principal] which showed my details n read as:

"* in the article training details means vacancy is available against the student and this also covers form 108 received but pending for want of d documents"

can anybody please explain as to wat it means n wat needs to b done in this case?

Please help