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Looks like SCVR record contains link to non-existing string.
The error comes from here. According to comment above this line, an engine should just skip problematic record since it unused anyway. Do you able to load this mod?
I just started a new playthrough with almost all lgnpc mods installed and couldn't find much info about compatibility between openmw and lgnpc .
Tel Uvirith changes the telvanni stronghold which shouldn't be present in the game yet (just reached level 2) .
The error seems hamrless though, thanks for the explanation.
I have posted this same error in these forums a while ago (cannot be bothered to find the exact post), but at the time one the responders said that the LGNPC team was aware of the error. The error seems harmless enough; at the same time, I should add that I have played the mod until the Hlaalu ambush quest, but never got passed it, just kept encountering more assassins. This could be a script error (I never passed the mod through openmw verifier to look for any syntactical errors), a mod conflict, or I am just doing something wrong. Anyway, hope it helps, regards.