This basically means that XeTeX couldn't find the font, and it's trying to fall back to using bitmap fonts, which have a .TFM (TeX Font Metrics) file.
What it probably means a disconnect between the 'installed for all users' list and '(A) in one of the directories XeTeX is looking in (B) there's an accessible fontcache entry pointing to (C) an accessible file , which (D) exactly matches the requested font name'
According to XeTeX, you're asking for "SolaimanLipi Normal" , but your font info says the Full name is "SolaimanLipi" So it looks to me that (D) is the problem.
Fixing it might be as simple as re-selecting the font name, or need you to dig into style sheets to change, it depends if the bug python and TeX disagreeing about names, or just an old font name that's not on your system.