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It also gives the following error when I press the home button:
"emc/task/taskintf.cc 976: Error on joint 0, command number 74"
if that helps at all...

I made sure that they agree.

Do you know what
"(PREOP + ERROR) could be caused by? or "Invalid input configuration"?

Also, did you take a look at the .hal and .ini file? There are a few things in the .hal file that I don't know the purpose of, yet LinuxCNC doesn't run without them, so I'd appreciate an explanation of why they're necessary-if you're willing.

Personally I would suggest tp use the .comp format:

linuxcnc.org/docs/2.9/html/man/man9/userkins.9.html

But regardless,
Forward kinematic uses the joint positions to calculate the cartesian coordinate positions 
Inverse kinematic uses the cartesian coordinate positions (ie the position commands of the motion planner) to calculate the joint positions (ie basically the commands that get sent to your motor drives)

One needs to be the mathematical inverse of the other (otherwise the values will run off and you will get limit violation errors)

I was able to check the connection yesterday, you were right, [GND pulse - dir -] I had them bridged. !!

I always connected them, I understand that it's wrong! I like to learn because the board can get burned with this connection. I thought that the ground from both the driver and the board should be connected.

thank you!!!