Does anyone here know what might be the cause of this error?

e: java.lang.IllegalArgumentException: Unbound type parameters are forbidden: [Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrTypeParameterSymbolImpl@69e10c4e, Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrTypeParameterSymbolImpl@782ec94]

Ive read that it might be because of synthetic imports, but I cannot find any. Are there any other reason for this to occur?

Unfortunately, that message alone doesn't tell us a whole lot, other than that something went wrong. If you don't have any other kotlin plugins or code generation, this can occur due to latent bugs in the compose compiler. If you're able to create a minimal repro in a standalone github project, then please feel free to file a bug.