diff --git a/source/errors.mjs b/source/errors.mjs
index 7ef6e37..bdc1f72 100644
--- a/source/errors.mjs
+++ b/source/errors.mjs
@@ -1,5 +1,17 @@
 import { inspect } from 'node:util';
 
+// § GROUP: Regexp tokenization
+
+
+
+export class Tokenization_Error extends Error {
+	constructor(data) {
+		const { parser, value, index, end_index } = data;
+		super(`Tokenization_Error`);	//TODO: Format message
+		this.data = data;
+	}
+}
+
 // § GROUP: Configuration field errors
 
 export class Data_Validation_Failed extends Error {
diff --git a/source/parsing/regexp-dispatch.mjs b/source/parsing/regexp-dispatch.mjs
index 300e802..31ba098 100644
--- a/source/parsing/regexp-dispatch.mjs
+++ b/source/parsing/regexp-dispatch.mjs
@@ -1,4 +1,6 @@
 import * as RE from '@efforting.tech/text/regexp';
+import { Tokenization_Error } from '@efforting.tech/errors';
+
 
 // NOTE: 	There are some open questions about this implementation and API which may change as the library matures.
 //			Check out the example at experiments/regexp-tokenizer.mjs for more information on how to use this in its current state.
@@ -104,7 +106,7 @@ export class RegExp_Tokenizer {
 	_handle_default_match(value, index, end_index=null) {
 		const { default_action } = this;
 		if (!default_action) {
-			throw new Parsing_Error({ parser: this, value, index, end_index });
+			throw new Tokenization_Error({ parser: this, value, index, end_index });
 		}
 		return new Default_Match(value, index, end_index, default_action);
 	}