diff --git a/crates/aiken-project/src/blueprint/error.rs b/crates/aiken-project/src/blueprint/error.rs
index a7f93555..0fceaab4 100644
--- a/crates/aiken-project/src/blueprint/error.rs
+++ b/crates/aiken-project/src/blueprint/error.rs
@@ -44,7 +44,7 @@ pub enum Error {
     #[diagnostic(code("aiken::blueprint::interface"))]
     Schema {
         error: schema::Error,
-        #[label("invalid contract's boundary")]
+        #[label("invalid validator's boundary")]
         location: Span,
         #[source_code]
         source_code: NamedSource,
@@ -58,6 +58,11 @@ pub enum Error {
     #[error("I didn't find any parameters to apply in the given validator.")]
     #[diagnostic(code("aiken::blueprint::apply::no_parameters"))]
     NoParametersToApply,
+
+    #[error("I couldn't compute the address of the given validator because it's parameterized by {} parameter(s)!", format!("{n}").purple())]
+    #[diagnostic(code("aiken::blueprint::address::parameterized"))]
+    #[diagnostic(help("I can only compute addresses of validators that are fully applied. For example, a {keyword_spend} validator must have exactly 3 arguments: a datum, a redeemer and a context. If it has more, they need to be provided beforehand and applied directly in the validator. Applying parameters change the validator's compiled code, and thus the address.\n\nThis is why I need you to apply parmeters first.", keyword_spend = "spend".purple()))]
+    ParameterizedValidator { n: usize },
 }
 
 pub fn assert_return_bool(module: &CheckedModule, def: &TypedFunction) -> Result<(), Error> {
diff --git a/crates/aiken-project/src/lib.rs b/crates/aiken-project/src/lib.rs
index d54c2ff4..da0923ef 100644
--- a/crates/aiken-project/src/lib.rs
+++ b/crates/aiken-project/src/lib.rs
@@ -316,9 +316,14 @@ where
             |known_validators| Error::MoreThanOneValidatorFound { known_validators };
         let when_missing = |known_validators| Error::NoValidatorNotFound { known_validators };
         blueprint.with_validator(title, purpose, when_too_many, when_missing, |validator| {
-            Ok(validator
-                .program
-                .address(Network::Testnet, delegation_part.to_owned()))
+            let n = validator.parameters.len();
+            if n > 0 {
+                Err(blueprint::error::Error::ParameterizedValidator { n }.into())
+            } else {
+                Ok(validator
+                    .program
+                    .address(Network::Testnet, delegation_part.to_owned()))
+            }
         })
     }