Unable to find the vertex factor for phi^4 theory

Questions
,
1

I am trying to create a UFO (Universal Feynman Output) model for phi^4 theory. It should have a vertex factor of -I * lambda. However, upon creating the model and finding Feynman rules, I am getting some weird looking vertex factor. I have attached my .fr file and notebook for reference.

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This is the .fr file:-
" iM$ModelName = “Phi4”

M$Information = {

Authors -> "Aditya Agarwal",

Version -> "0.1",

Date -> "17.09.2026"

};

M$Parameters = {

lam == {

ParameterType -> External,

Value -> 0.1,

BlockName -> COUPLINGS

} ,

mphi == {

ParameterType -> External,

Value -> 100.0,

BlockName -> MASS

}

};

M$ClassesDescription = {

S\[1\] == {

	ClassName -> \\\[Phi\],

	SelfConjugate -> True,

	Mass -> {mphi, Internal},

	Width -> {wphi, 0},

	PropagatorLabel -> phi,

	PropagatorType -> S,

	PropagatorArrow -> None,

	ParticleName -> "Phi"

}

};

Lkinetic = (1/2)ME[\[Mu], \[Nu]]del[\[Phi], \[Mu]]del[\[Phi], \[Nu]] - (1/2)mphi^2 Power[\[Phi],2];

Lint = -(lam/24)Power[\[Phi],4];

L = Lkinetic + Lint;"

Any help will be appreciated.

Thank you all for your time