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diff --git a/core/src/de/congrace/exp4j/UnparsableExpressionException.java b/core/src/de/congrace/exp4j/UnparsableExpressionException.java
new file mode 100644
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+++ b/core/src/de/congrace/exp4j/UnparsableExpressionException.java
@@ -0,0 +1,47 @@
+/*
+   Copyright 2011 frank asseg
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+ */
+package de.congrace.exp4j;
+
+/**
+ * Exception for invalid expressions
+ * 
+ * @author fas@congrace.de
+ */
+public class UnparsableExpressionException extends Exception {
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * construct a new {@link UnparsableExpressionException}
+	 * 
+	 * @param c
+	 *            the character which could not be parsed
+	 * @param pos
+	 *            the position of the character in the expression
+	 */
+	public UnparsableExpressionException(char c, int pos) {
+		super("Unable to parse character at position " + pos + ": '" + String.valueOf(c) + "'");
+	}
+	/**
+	 * construct a new {@link UnparsableExpressionException}
+	 * 
+	 * @param msg 
+	 *            the error message
+	 */
+	public UnparsableExpressionException(String msg) {
+		super(msg);
+	}
+}