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Failed to execute CommandLineRunner
java.lang.NullPointerException: 	at org.bytedeco.javacpp.helper.opencv_core$AbstractArray.createIndexer(opencv_core.java:175)	at org.bytedeco.javacpp.helper.opencv_core$AbstractArray.createIndexer(opencv_core.java:165)	at id.ac.itb.sigit.pengenalanpola.ChainCodeWhiteConverter.getChainCode(ChainCodeWhiteConverter.java:49)	at id.ac.itb.sigit.pengenalanpola.PlatNomorApp.run(PlatNomorApp.java:58)	at org.springframework.boot.SpringApplication.runCommandLineRunners(SpringApplication.java:673)	at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:691)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:322)	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:139)	at id.ac.itb.sigit.pengenalanpola.PlatNomorApp.main(PlatNomorApp.java:32)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)