Hi all, I wonder if any one here is familiar with Feynrules package to implement new model by Mathematica. Actually I'm a new user for and try to implement Yukawa Lagrangian for new charged Higgs scalar called X and the charge conjugate Xbar with the SM fermions, I wrote the Lag. as : LX := X ( - ProjP[s1, s2] (( 3 CKM[i, j] Md[j] + Ml IndexDelta[i, j] )/4 vev) tB + ProjM[s1, s2] CKM[i, j] ( Y4 cB - Y3 sB)) uqbar[s1,i,cc].dq[s2,j,cc] + Xbar ( - ProjM[s1, s2] (( 3 Md CKM[i, j] + Ml IndexDelta[i, j] )/4 vev) tB + ProjP[s1, s2] CKM[i, j] ( Y4 cB - Y3 sB)) dqbar[s1,i,cc].uq[s2,j,cc] ; This is typically as the attached figure.. I took into account to define the quark fields by three indices : spin, generation, color, also all the Lag. parameters like Y4 and Y3 defined as External or Internal parameters . But when I run WriteUFO[LX], it gave me no vertices, so what's wrong here .. Bests, S.