I got this error because the mod tries to replace a code bloc that does not exist even if only BGT (v1.18) is installed.
[./override/ar0602.bcs] loaded, 66993 bytes [w_psionics_unleashed/baf/bgt/ar0602_o.baf] loaded, 1034 bytes [w_psionics_unleashed/baf/bgt/ar0602_n.baf] loaded, 2244 bytes [./override/SPECIFIC.IDS] loaded, 236 bytes WARNING: cannot find block matching [w_psionics_unleashed/baf/bgt/ar0602_o.baf] [w_psionics_unleashed/baf/bgt/ar0602_o2.baf] loaded, 215 bytes [w_psionics_unleashed/baf/bgt/ar0602_n2.baf] loaded, 1006 bytes [w_psionics_unleashed/baf/bgt/ar0602_o3.baf] loaded, 2418 bytes [w_psionics_unleashed/baf/bgt/ar0602_n3.baf] loaded, 2564 bytes override/ar0602.bcs copied to w_psionics_unleashed/backup/10/ar0602.bcs, 66993 bytes Copied [ar0602.bcs] to [override/ar0602.bcs] Copying 1 file ...
code bloc in question:
ActionOverride(Player1,MakeUnselectable(2147483647)) ActionOverride(Player2,MakeUnselectable(2147483647)) ActionOverride(Player3,MakeUnselectable(2147483647)) ActionOverride(Player4,MakeUnselectable(2147483647)) ActionOverride(Player5,MakeUnselectable(2147483647)) ActionOverride(Player6,MakeUnselectable(2147483647))