Problem getting a .raw stack into .obj

Hello, I am attempting to convert a .raw image stack into an .obj file to put into meshlab. I have windows fiji. When I try to save it as an object it comes up with this error:

(Fiji Is Just) ImageJ 2.0.0-rc-69/1.52p; Java 1.8.0_172 [32-bit]; Windows 10 10.0; 63MB of 1183MB (5%)
 
java.lang.IllegalArgumentException: Unsupported image type
	at ij3d.Volume.setImage(Volume.java:165)
	at ij3d.Volume.<init>(Volume.java:126)
	at marchingcubes.MCTriangulator.getTriangles(MCTriangulator.java:53)
	at marchingcubes.ExportMesh_.exportToMesh(ExportMesh_.java:36)
	at marchingcubes.ExportMesh_.run(ExportMesh_.java:202)
	at ij.IJ.runUserPlugIn(IJ.java:230)
	at ij.IJ.runPlugIn(IJ.java:193)
	at ij.Executer.runCommand(Executer.java:137)
	at ij.Executer.run(Executer.java:66)
	at java.lang.Thread.run(Thread.java:748)

Is there anything I am missing that could help with this? Any help would be greatly appreciated.

Jason

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I have this same issue and have been looking for workarounds for months. Help would be greatly appreciated.