using text files for 2d/3d particle tracker plugin

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using text files for 2d/3d particle tracker plugin

swalkup
Hi Everyone,
I am trying to track particles using the 2d/3d particle plugin. I have text files of the coordinates of detected particles that are formatted the way the particle tracker manual states (example below).

frame 98
279.6857  389.8000
330.1562  47.9843
477.3076  511.8974


When I go to import the text file and use the particle tracker plugin, I get this message and it won't work.....

EXCEPTION
java.lang.NullPointerException
        at mosaic.plugins.ParticleTracker3DModular_.run(ParticleTracker3DModular_.java:210)
        at ij.plugin.filter.PlugInFilterRunner.<init>(PlugInFilterRunner.java:78)
        at ij.IJ.runUserPlugIn(IJ.java:185)
        at ij.IJ.runPlugIn(IJ.java:150)
        at ij.Executer.runCommand(Executer.java:127)
        at ij.Executer.run(Executer.java:64)
        at java.lang.Thread.run(Thread.java:680)

Any help would be greatly appreciated!!

Thank you!