java.lang.NoClassDefFoundError: This exception has no message.

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java.lang.NoClassDefFoundError:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
at javax.swing.text.html.CSS.getValidFontNameMapping(CSS.java:906)
at javax.swing.text.html.CSS$FontFamily.parseCssValue(CSS.java:1858)
at javax.swing.text.html.CSS.getInternalCSSValue(CSS.java:529)
at javax.swing.text.html.CSS.addInternalCSSValue(CSS.java:514)
at javax.swing.text.html.StyleSheet.addCSSAttribute(StyleSheet.java:464)
at javax.swing.text.html.HTMLDocument$HTMLReader$ConvertAction.start(HTMLDocument.java:2690)
at javax.swing.text.html.HTMLDocument$HTMLReader.handleStartTag(HTMLDocument.java:2121)
at javax.swing.text.html.parser.DocumentParser.handleStartTag(DocumentParser.java:142)
at javax.swing.text.html.parser.Parser.startTag(Parser.java:380)
at javax.swing.text.html.parser.Parser.parseTag(Parser.java:1846)
at javax.swing.text.html.parser.Parser.parseContent(Parser.java:1881)
at javax.swing.text.html.parser.Parser.parse(Parser.java:2047)
at javax.swing.text.html.parser.DocumentParser.parse(DocumentParser.java:106)
at javax.swing.text.html.parser.ParserDelegator.parse(ParserDelegator.java:78)
at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:229)
at undefined.HTMLReader.FindHTMLFiles(HTMLReader.java:84)
at undefined.HTMLReader.FindHTMLFiles(HTMLReader.java:177)
at undefined.DocumentManager.addFile(DocumentManager.java:125)

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