can't modified field

I can't make it editable. is is generated. how can I do?

java.lang.RuntimeException: can,t modified Field:VERSION_CODE(I), in class :Lit/croccio/allvideo/BuildConfig; at com.euler.patch.diff.DiffInfo.addModifiedFields(DiffInfo.java:88) at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:147) at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:129) at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:123) at com.euler.patch.diff.DexDiffer.diff(DexDiffer.java:48) at com.euler.patch.ApkPatch.doPatch(ApkPatch.java:68) at com.euler.patch.Main.main(Main.java:97) 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:498) at com.baidu.iknow.apkpatch.Main.main(Main.java:21)