how to define a two node link element in 3D model ?

[luochuizi]

i want to define a two node link element,the code like this:
element twoNodeLink 300 121 104 -mat 4 4 4 -dir 1 2 6 -orient 1 0 0 1 0 1
but the opensees work wrong.like this:
WARNING TwoNodeLink::setUp() - element: 300
ignoring nodes and using specified local x vector to determine orientation.
what should i do?

[selimgunay]

Are nodes 121 and 104 at the same coordinates?

[luochuizi]

element twoNodeLink 300 112 104 -mat 4 4 4 -dir 1 2 3 -orient -4.0 0.0 3.5 0.0 -1.0 0.0
twonodelink element work faired like this:
UMD2FA: matrix is singular. Only 648 pivots found.
WARNING UmfpackGenLinSolver::solve(void)- 4 returned in factorization UMD2FA()
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 0.02
OpenSees > analyze failed, returned: -3 error flag
by the way,the node 112 and 104:
node 112 8.000E+003 5.000E+003 0.000E+000
node 104 4.000E+003 5.000E+003 3.500E+003