Error while exporting:
TypeError: Cannot read properties of undefined (reading 'bl')
at com.google.gwt.emul.java.lang.Number.intValue(Number.java:353) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:6704:47)
at new com.tom.cpm.shared.editor.project.JsonMap.getInt(JsonMap.java:22) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2054:145)
at com.tom.cpm.blockbench.proxy.Cube.getData(Cube.java:161) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1726:331)
at com.tom.cpm.blockbench.convert.BlockbenchExport.makePart(BlockbenchExport.java:1104) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1820:124)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert$lambda(BlockbenchExport.java:1090) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1819:19)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1825:41)
at com.google.gwt.emul.java.util.ArrayList.forEach(ArrayList.java:175) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2247:81)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1819:30)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1825:41)
at com.google.gwt.emul.java.util.ArrayList.forEach(ArrayList.java:175) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2247:81)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1819:30)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1825:41)
at com.google.gwt.emul.java.util.ArrayList.forEach(ArrayList.java:175) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2247:81)
at com.tom.cpm.blockbench.convert.BlockbenchExport.finishConvert(BlockbenchExport.java:1089) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1818:17)
at com.tom.cpm.blockbench.convert.BlockbenchExport.doExport(BlockbenchExport.java:324) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1785:42)
at com.google.gwt.emul.java.util.stream.StreamImpl.tryAdvance$lambda(StreamImpl.java:426) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7392:492)
at com.google.gwt.emul.java.util.stream.StreamImpl.tryAdvance(StreamImpl.java:423) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7395:42)
at com.google.gwt.emul.java.util.Spliterators.tryAdvance(Spliterators.java:462) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7141:48)
at com.google.gwt.emul.java.util.Spliterators.tryAdvance(Spliterators.java:458) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7143:171)
at com.google.gwt.emul.java.util.stream.StreamImpl.tryAdvance(StreamImpl.java:421) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7394:77)
at com.google.gwt.emul.java.util.Spliterator.forEachRemaining(Spliterator.java:51) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7139:105)
at com.google.gwt.emul.java.util.Spliterator.forEachRemaining(Spliterator.java:50) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7149:36)
at com.google.gwt.emul.java.util.stream.StreamImpl.forEachOrdered(StreamImpl.java:557) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:7369:30)
at com.google.gwt.emul.java.util.stream.StreamSupport.stream(StreamSupport.java:74) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1730:1187)
at com.tom.cpm.blockbench.convert.ProjectConvert.prepExport$lambda$lambda(ProjectConvert.java:64) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1972:42)
at com.tom.cpm.blockbench.convert.ProjectConvert.prepExport$lambda(ProjectConvert.java:61) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1998:41)
at com.tom.cpm.web.client.render.RenderSystem.withContext(RenderSystem.java:1228) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:6513:67)
at com.tom.cpm.blockbench.convert.ProjectConvert.prepExport$lambda(ProjectConvert.java:61) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1971:23)
at com.tom.cpm.blockbench.convert.ProjectConvert.prepExport(ProjectConvert.java:60) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1997:55)
at com.google.gwt.dev.jjs.intrinsic.com.google.gwt.lang.Runtime(Runtime.java:165) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:17:47)
at new Promise ()
at com.tom.cpm.blockbench.convert.ProjectConvert.prepExport(ProjectConvert.java:60) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1996:48)
at com.tom.cpm.blockbench.util.PopupDialogs.runTaskWithWarning(PopupDialogs.java:144) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2154:32)
at com.tom.cpm.blockbench.convert.ProjectConvert.exportWithWarnings(ProjectConvert.java:56) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1964:212)
at com.tom.cpm.blockbench.format.CPMCodec.init(CPMCodec.java:54) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:2034:52)
at com.google.gwt.dev.jjs.intrinsic.com.google.gwt.lang.Runtime(Runtime.java:165) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:17:47)
at com.tom.cpm.blockbench.BBActions.load$lambda(BBActions.java:97) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:1631:63)
at com.google.gwt.dev.jjs.intrinsic.com.google.gwt.lang.Runtime(Runtime.java:165) (https://tom5454.com/cpm/cpm_plugin/new/cpm_plugin.js?_=1705089031083:17:47)
at Action.click (file:///C:/Users/5855h/AppData/Local/Programs/Blockbench/resources/app.asar/js/interface/actions.js:266:10)
at Action.trigger (file:///C:/Users/5855h/AppData/Local/Programs/Blockbench/resources/app.asar/js/interface/actions.js:332:10)
at HTMLLIElement. (file:///C:/Users/5855h/AppData/Local/Programs/Blockbench/resources/app.asar/js/interface/actions.js:291:10)

I am sensing that Blockbench does not like extra file formats being added.