dunno what happened

[roystrainz@…]

What steps will reproduce the problem?

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if possible.

Identification: JOSM/1.5 (UNKNOWN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1809 (17763)
Memory Usage: 302 MB / 7268 MB (276 MB allocated, but free)
Java version: 1.8.0_211-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 3840x2160
Maximum Screen Size: 3840x2160

Last errors/warnings:
- W: The revision file '/REVISION' is missing.
- E: java.io.IOException: Failed to open input stream for resource 'resource://data/preferences.xsd'
- E: Unable to register font DroidSans.ttf
- E: java.io.IOException: Failed to open input stream for resource 'resource://data/fonts/DroidSans.ttf'
- E: Unable to register font DroidSans-Bold.ttf
- E: java.io.IOException: Failed to open input stream for resource 'resource://data/fonts/DroidSans-Bold.ttf'
- E: Handled by bug report queue: java.lang.ExceptionInInitializerError. Cause: org.openstreetmap.josm.tools.JosmRuntimeException: java.io.IOException: Failed to open input stream for resource 'resource://data/projection/custom-epsg'. Cause: java.io.IOException: Failed to open input stream for resource 'resource://data/projection/custom-epsg'


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: main (1)
java.lang.ExceptionInInitializerError
	at org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference.registerProjectionChoice(ProjectionPreference.java:262)
	at org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference.registerProjectionChoice(ProjectionPreference.java:284)
	at org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference.<clinit>(ProjectionPreference.java:83)
	at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:899)
	at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:277)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:704)
Caused by: org.openstreetmap.josm.tools.JosmRuntimeException: java.io.IOException: Failed to open input stream for resource 'resource://data/projection/custom-epsg'
	at org.openstreetmap.josm.data.projection.Projections.<clinit>(Projections.java:175)
	... 6 more
Caused by: java.io.IOException: Failed to open input stream for resource 'resource://data/projection/custom-epsg'
	at org.openstreetmap.josm.io.CachedFile.getInputStream(CachedFile.java:230)
	at org.openstreetmap.josm.io.CachedFile.getContentReader(CachedFile.java:259)
	at org.openstreetmap.josm.data.projection.Projections.loadProjectionDefinitions(Projections.java:301)
	at org.openstreetmap.josm.data.projection.Projections.<clinit>(Projections.java:170)
	... 6 more

[GerdP]

Seems you have compiled your own JOSM. I'd suggest to use

ant clean dist