diff -r 3b8b1da2ff29 -r 12b1f4649ab1 src/Tools/GraphBrowser/graphbrowser/ParseError.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/GraphBrowser/graphbrowser/ParseError.java	Fri Jul 16 12:55:02 2021 +0200
@@ -0,0 +1,5 @@
+package isabelle.graphbrowser;
+
+class ParseError extends Exception {
+	public ParseError(String s) { super(s); }
+}