2 files changed, 16 insertions, 1 deletions
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java b/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java
index 6126a0c..fda2e15 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/config/ProjectConfig.java
@@ -1,8 +1,10 @@
 package org.zwobble.hobgoblin.compiler.config;
 
 import org.zwobble.hobgoblin.compiler.output.generators.Generator;
+import org.zwobble.hobgoblin.compiler.output.generators.errors.UnknownGeneratorError;
 import org.zwobble.hobgoblin.compiler.output.generators.javapreciselymatchers.JavaPreciselyMatchersGenerator;
 import org.zwobble.hobgoblin.compiler.output.generators.javatypes.JavaTypesGenerator;
+import org.zwobble.hobgoblin.compiler.sources.FileFragmentSource;
 import org.zwobble.json5.reader.Json5ObjectReader;
 import org.zwobble.sourcetext.SourceText;
 
@@ -41,7 +43,10 @@ public record ProjectConfig(
                     JavaPreciselyMatchersGenerator.parseOutputConfig(projectRoot, outputJson);
 
                 default ->
-                    throw new UnsupportedOperationException("TODO");
+                    throw new UnknownGeneratorError(
+                        generatorName.value(),
+                        new FileFragmentSource(generatorName.sourceRange())
+                    );
             };
 
             outputs.add(output);
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/errors/UnknownGeneratorError.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/errors/UnknownGeneratorError.java
new file mode 100644
index 0000000..70fab43
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/errors/UnknownGeneratorError.java
@@ -0,0 +1,10 @@
+package org.zwobble.hobgoblin.compiler.output.generators.errors;
+
+import org.zwobble.hobgoblin.compiler.errors.SourceError;
+import org.zwobble.hobgoblin.compiler.sources.Source;
+
+public class UnknownGeneratorError extends SourceError {
+    public UnknownGeneratorError(String generatorName, Source source) {
+        super("Unknown generator: " + generatorName, source);
+    }
+}