Blocage in the execution of my program in matlab

Hello,

When I start my program, matlab remains busy and does not stop until I have stopped it manually with Ctrl + C and then gave me the following error

>> Energies

Operation terminated by user during mupadengine/evalin (line 102)

In mupadengine/feval (line 161)

[S,err] = evalin(engine,stmt,'message');

In sym/simplify (line 63)

rSym = feval(symengine, 'simplify', s,...

In Energies (line 103)

EcL6 = simplify(EcL6);

And when I comment on the line " EcL6 = simplify(EcL6); " matlab finish program execution quickly

Therefore what can I do to get out of this blockage?

Think you