生成补丁文件一直报错

C:\Users\chuwe\Desktop\apkpatch>apkpatch -f app2.0.apk -t app1.0.apk -o output -k keystore.jks -p 123456 -a keystore -e 123456

java.lang.RuntimeException: can,t modified Field:VERSION_CODE(I), in class :Lcom/chuwe1/andfixdemo/BuildConfig;
at com.euler.patch.diff.DiffInfo.addModifiedFields(DiffInfo.java:88)
at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:125)
at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:101)
at com.euler.patch.diff.DexDiffer.compareField(DexDiffer.java:95)
at com.euler.patch.diff.DexDiffer.diff(DexDiffer.java:32)
at com.euler.patch.ApkPatch.doPatch(ApkPatch.java:68)
at com.euler.patch.Main.main(Main.java:97)

Reproduce the reported apkpatch command with app2.0.apk and app1.0.apk, then start at com.euler.patch.Main.main and follow ApkPatch.doPatch through DexDiffer.compareField and DiffInfo.addModifiedFields. Check the VERSION_CODE failure in BuildConfig and compare the two APK inputs. Done means the command generates the requested patch without this RuntimeException.

Written by the indexing model from the issue text.