not compiling on Ubuntu Linux

tried to compile a test project on Ubuntu Lite and got this error

LateralGM Version: 1.8.234
Working Directory: /home/hughiep/enigma-dev/lateralgm.jar

Operating System: Linux
Version: 5.4.0-100-generic
Architecture: amd64

Java Name: OpenJDK 64-Bit Server VM
Java Vendor: Ubuntu
Version: 11.0.13

Current Thread: AWT-EventQueue-0
Available processors (cores): 8
Free memory (bytes): 240576800
Maximum memory (bytes): 4177526784
Total memory available to JVM (bytes): 264241152

File system root: /
Total space (bytes): 490651459584
Free space (bytes): 453501050880
Usable space (bytes): 428505882624

Stack trace:

java.lang.NullPointerException
at java.desktop/javax.swing.text.DefaultStyledDocument.getParagraphElement(DefaultStyledDocument.java:600)
at java.desktop/javax.swing.text.StyledEditorKit$AttributeTracker.updateInputAttributes(StyledEditorKit.java:243)
at java.desktop/javax.swing.text.StyledEditorKit$AttributeTracker.caretUpdate(StyledEditorKit.java:278)
at java.desktop/javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:412)
at java.desktop/javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:4489)
at java.desktop/javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextComponent.java:4511)
at java.desktop/javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:812)
at java.desktop/javax.swing.text.DefaultCaret.changeCaretPosition(DefaultCaret.java:1283)
at java.desktop/javax.swing.text.DefaultCaret.handleSetDot(DefaultCaret.java:1182)
at java.desktop/javax.swing.text.DefaultCaret.setDot(DefaultCaret.java:1163)
at java.desktop/javax.swing.text.DefaultCaret.setDot(DefaultCaret.java:1060)
at java.desktop/javax.swing.text.JTextComponent.setCaretPosition(JTextComponent.java:1691)
at org.enigma.frames.ProgressFrame.append(ProgressFrame.java:164)
at org.enigma.backend.EnigmaCallbacks$OpenFile$1.run(EnigmaCallbacks.java:177)

it ran fine........but when i tried to compile into an executable............error appeared