Yes they exists , like we are made of mass , they are made of energy , if inanimate mass can evolve to a complex species like human being in few billions years, Why cannot eneregy evolve to form a complex ghost .
Now you need to find out ways to communicate with them.
> if inanimate mass can evolve to a complex species like human being in few billions years
My view: Mass can never be inanimate, as atoms make up any mass, and atoms are certainly not inanimate (atoms posses some amount of motion)... Maybe you meant inanimate as "inorganic", "non-living", or something along those lines. We are all basically made up of "non-living" atoms, even after all those years of evolution. We are just lucky that this soup of "non-living" matter came together under the right conditions, at the right time, all those aeons ago, to make up the basis of all life: amino acids and then proteins and the related.
> Why cannot energy evolve to form a complex ghost?
Energy is something that is
always associated with a
physical Force. Force, in turn, always relates with mass, '

', travelling with an acceleration, '

', as

, at least in Newtonian Mechanics. It is not unknown that Energy is always associated with mass even in quantum physics, and is made apparent by Einstein's famous equation,

, where '

' is mass. Energy cannot
evolve, as such, into something self-contained and free from physical association (be it gravitational force, or something more obscure). Energy is not capable of becoming something else (transforming) until an external trigger acts on it, and always remains a form of energy that is again associated with mass. See
this for more information. Similarly, Energy cannot manifest itself into a physical force, because it always
depends on force to exist.