Long Live Ghosts!
Ať žijí duchové! (original)
A trespassing gang of boys encounter a ghost in the ruins of a castle. When they rescue the ghost who is caught in a trapset, they become allies in a fight to prevent ruins from being turned into mushroom farm by the city authorities.
Starring Dana Vávrová, Jiří Procházka, Jiří Sovák, Vlastimil Brodský, Lubomír Lipský, Věra Tichánková, Petr Starý, Igor Nachtigal, David Vlček, Tomáš Holý
It's a kids and family movie, and has a rating of 7.7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.