I've got the same problem with Tacview 1.0 on DCS A-10 1.1.1.0 and BS2. Some Object_Type referenced in the export script are no more defined in the DCS database (the script could not be executed).
To fix it, until an official patch from the Tacview team, I've commented the
following lines in the "DCS A-10C\Config\Export\TacviewExportDCS.lua" export script file (i.e. append -- at their beginning):
(l.83) -- [wsTypeAutogun] = 0x2c, -- Infantry
(l.84) -- [wsTypeSoldier_AK] = 0x2c, -- Infantry
(l.85) -- [wsTypeSandbox] = 0x89, -- Building
(l.86) -- [wsTypeBunker] = 0x89, -- Building
(l.91) -- [wsTypeRPG] = 0x2c, -- Infantry
(l.92) -- [wsTypeSoldier_RPG] = 0x2c, -- Infantry
(l.97) -- [wsTypePredator_TrojanSpirit] = 0x28, -- Light/Unarmed vehicles
(l.98) -- [wsTypePredator_GCS] = 0x28, -- Light/Unarmed vehicles
I hope it will work for you on Tacview 1.1.