p5 is not defined

[AdoHaha]

Hi,
when I want to use vectors for example:
a= new p5.Vector(576, 324);
p5.Vector.add(v1, v2)
or in any other way ( other than through createVector function)
I get this error:
Uncaught ReferenceError: p5 is not defined

[alonss0]

I don't know if it can help u at this point, but I fixed it loading the p5.js library in the head of the html doc.