Here's why:
* "Reve" is the singular form of "dream" in French, but it's not used correctly here.
* "Est ce que" is a way to ask a question in French, but it doesn't make sense with "tu aimerais" in this context.
* "Tu aimerais" means "you would like" in French.
To make this phrase grammatically correct and meaningful, you need to rephrase it.
For example, you could say:
* "Rêves-tu de ce que tu aimerais ?" (Do you dream about what you would like?)
* "Qu'est-ce que tu aimerais rêver ?" (What would you like to dream about?)
These phrases are both grammatically correct and make sense in French.