Error when running but not in eclipse

[t3hkr3w]

In the making of my new mod I don't have any errors at all popping up in eclipse but when I run the client to test out my work and I get a Minecraft crash from this line that has no errors:

 

HempSeed = new ItemHempSeed(7001,GrowersParadiseCore.HempPlant.blockID,net.minecraft.src.Block.tilledField.blockID).setItemName("Hemp Seed").setIconIndex(1);
LanguageRegistry.addName(HempSeed, "\u00a7AHemp Seed");

 

And here is the crash report to anyone that it will help:

http://pastebin.com/25AqTgKC

 

In advance all help is much appreciated, Thanks

[SanAndreaP]

Do you initialize following block: GrowersParadiseCore.HempPlant

before you initialize the item (the line you gave us)?

[t3hkr3w]

I declared that a couple lines after but I just changed it around and it works perfectly, thanks so much