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makeuf2-tool's Issues

On linux, invoking the tool after exporting the binary results in NPE

Describe the bug

When trying to use the tool from the Arduino IDE it throws a NullPointerException. I am using Linux, Ubuntu 20.04 64-bit, Arduino 1.8.8 and 1.8.16 both exhibit this behaviour.

To Reproduce
Export binary
Invoke tool
A 0-byte uf2 is produced and the following stack trace appears:

java.lang.NullPointerException
	at java.lang.Long.decode(Long.java:892)
	at com.makeUF2.makeUF2.makeUF2.createUF2(makeUF2.java:232)
	at com.makeUF2.makeUF2.makeUF2.run(makeUF2.java:290)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
 Create Failed!

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