Question: Problem in Physics package, with the command "FeynmanDiagrams"

Dear Sir,

I have a problem with the command. In order to learn the use of this command for Feynman Diagrams, I loaded the help page [Physics,FeynmanDiagrams], I tried the given example  by accurately applying the indicated commands, i.e.

after setting Physics[Setup](mathematicalnotation = true);

"Coordinates(X, Y, Z)", next the Langrangian example  "L := lambda*phi(X)^4+sigma*eta(X)^3", then the command


The error maessage is :

"Error, unexpected result from Typesetting" ,and also "

"Error, unexpected result from Typesetting".

Note these errors appear also in the help page itself.

When I click on the link included in the error message, I go on a web page indicating "There is no help page available for this error", and they recommend to discuss my problem with Maple experts on MaplePrimes.

I sew that _NP represent the normal product of fields.

Could you say me, please, where is the error ?

Many thanks




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