Hi! I have problem with plugin (v42) at mcpc+ 1.6.4 server.
Error log:
21:34:21 [INFO] [Lift] [DEBUG] Starting elevator gen caused by: Button press v42
21:34:21 [INFO] ==Unknown Error==
21:34:21 [INFO] Yscan: 69
21:34:21 [INFO] Block: X473
21:34:21 [INFO] Is Valid Block: false
21:34:21 [INFO] Is Base Block: false
21:34:22 [INFO] [Lift] Redstone elevator generation returned a null object. Please report circumstances that generated this error.
21:34:24 [INFO] [Lift] [DEBUG] Starting elevator gen caused by: Button press v42
21:34:24 [INFO] ==Unknown Error==
21:34:24 [INFO] Yscan: 64
21:34:24 [INFO] Block: X473
21:34:24 [INFO] Is Valid Block: false
21:34:24 [INFO] Is Base Block: false
21:34:24 [INFO] [Lift] Redstone elevator generation returned a null object. Please report circumstances that generated this error.
21:34:32 [INFO] [Lift] [DEBUG] Starting elevator gen caused by: MXPLRS_Kirill v42
21:34:32 [INFO] ==Unknown Error==
21:34:32 [INFO] Yscan: 64
21:34:32 [INFO] Block: X473
21:34:32 [INFO] Is Valid Block: false
21:34:32 [INFO] Is Base Block: false
21:34:32 [INFO] [Lift] Player elevator generation returned a null object. Please report circumstances that generated this error.

Configuration default.

The issue you are having is exceptionally likely to be due to Railcraft's tracking block (visible with the goggles as the tracking aura), you can disable it by setting block.hidden to 0 in Railcraft's config. The default ID of this block is 473.