How to copy files from s3 to s3 same folder? - amazon-s3

Question

I am trying to combine log files from s3 to s3 using the following command.
s3-dist-cp --src s3://path/to/ym=2020/ --dest s3://path/to/ym=2020/ --groupBy='.*/(\d{8}).+(\.json) --deleteOnSuccess'
I have the following files in
s3://path/to/ym=2020/20200802010010.json
s3://path/to/ym=2020/20200802010020.json
s3://path/to/ym=2020/20200802010030.json
s3://path/to/ym=2020/20200802010040.json
s3://path/to/ym=2020/20200802010050.json
s3://path/to/ym=2020/20200803010010.json
s3://path/to/ym=2020/20200803010020.json
s3://path/to/ym=2020/20200803010030.json
s3://path/to/ym=2020/20200803010040.json
s3://path/to/ym=2020/20200803010050.json
expected result is
s3://path/to/ym=2020/20200802.json
s3://path/to/ym=2020/20200803.json
but I get the following errors
20/08/04 03:29:14 INFO s3distcp.S3DistCp: Created 1 files to copy 856 files
Exception in thread "main" java.lang.NullPointerException
at com.amazon.ws.emr.hadoop.fs.s3n.S3NativeFileSystem.mkdirs(S3NativeFileSystem.java:1052)
at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1961)
at com.amazon.ws.emr.hadoop.fs.EmrFileSystem.mkdirs(EmrFileSystem.java:443)
at com.amazon.elasticmapreduce.s3distcp.S3DistCp.run(S3DistCp.java:893)
at com.amazon.elasticmapreduce.s3distcp.S3DistCp.run(S3DistCp.java:728)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
at com.amazon.elasticmapreduce.s3distcp.Main.main(Main.java:22)
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 org.apache.hadoop.util.RunJar.run(RunJar.java:239)
at org.apache.hadoop.util.RunJar.main(RunJar.java:153)
The following command is working.(change dest path to other path)
s3-dist-cp --src s3://path/to/ym=2020/ --dest s3://path/to/archives/ym=2020/ --groupBy='.*/(\d{8}).+(\.json) --deleteOnSuccess'