REQUIRED for all errors and issues:
a) GATK version used: gatk-4.2.4.0

b) Exact command used: gatk GenomicsDBImport -R  /ddn/gs1/home/li11/project2017/exomeSeq/SangerWG/GRCm38_68_ref/GRCm38_68.fa  --genomicsdb-workspace-path /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/testDir/PONtest/pon_db    -V /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/NormalSamples/MD6831b_output_raw_snps_indels.vcf.gz  -V /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/NormalSamples/MD6837b_output_raw_snps_indels.vcf.gz 

c) Entire program log:

20:31:59.033 INFO  NativeLibraryLoader - Loading libgkl_compression.so from jar:file:/ddn/gs1/home/li11/tools/GATK/gatk-4.2.4.0/gatk-package-4.2.4.0-local.jar!/com/intel/gkl/native/libgkl_compression.so
May 24, 2022 8:31:59 PM shaded.cloud_nio.com.google.auth.oauth2.ComputeEngineCredentials runningOnComputeEngine
INFO: Failed to detect whether we are running on Google Compute Engine.
20:31:59.271 INFO  GenomicsDBImport - ------------------------------------------------------------
20:31:59.272 INFO  GenomicsDBImport - The Genome Analysis Toolkit (GATK) v4.2.4.0
20:31:59.272 INFO  GenomicsDBImport - For support and documentation go to https://software.broadinstitute.org/gatk/
20:31:59.272 INFO  GenomicsDBImport - Executing as li11@ehshpclp134 on Linux v3.10.0-1127.19.1.el7.x86_64 amd64
20:31:59.272 INFO  GenomicsDBImport - Java runtime: Java HotSpot(TM) 64-Bit Server VM v1.8.0_92-b14
20:31:59.272 INFO  GenomicsDBImport - Start Date/Time: May 24, 2022 8:31:58 PM EDT
20:31:59.272 INFO  GenomicsDBImport - ------------------------------------------------------------
20:31:59.273 INFO  GenomicsDBImport - ------------------------------------------------------------
20:31:59.273 INFO  GenomicsDBImport - HTSJDK Version: 2.24.1
20:31:59.273 INFO  GenomicsDBImport - Picard Version: 2.25.4
20:31:59.273 INFO  GenomicsDBImport - Built for Spark Version: 2.4.5
20:31:59.274 INFO  GenomicsDBImport - HTSJDK Defaults.COMPRESSION_LEVEL : 2
20:31:59.274 INFO  GenomicsDBImport - HTSJDK Defaults.USE_ASYNC_IO_READ_FOR_SAMTOOLS : false
20:31:59.274 INFO  GenomicsDBImport - HTSJDK Defaults.USE_ASYNC_IO_WRITE_FOR_SAMTOOLS : true
20:31:59.274 INFO  GenomicsDBImport - HTSJDK Defaults.USE_ASYNC_IO_WRITE_FOR_TRIBBLE : false
20:31:59.274 INFO  GenomicsDBImport - Deflater: IntelDeflater
20:31:59.274 INFO  GenomicsDBImport - Inflater: IntelInflater
20:31:59.274 INFO  GenomicsDBImport - GCS max retries/reopens: 20
20:31:59.274 INFO  GenomicsDBImport - Requester pays: disabled
20:31:59.275 INFO  GenomicsDBImport - Initializing engine
20:31:59.606 INFO  GenomicsDBImport - Shutting down engine
[May 24, 2022 8:31:59 PM EDT] org.broadinstitute.hellbender.tools.genomicsdb.GenomicsDBImport done. Elapsed time: 0.01 minutes.
Runtime.totalMemory()=2207776768
***********************************************************************

A USER ERROR has occurred: No intervals specified

***********************************************************************
Set the system property GATK_STACKTRACE_ON_USER_EXCEPTION (--java-options '-DGATK_STACKTRACE_ON_USER_EXCEPTION=true') to print the stack trace.
Using GATK jar /ddn/gs1/home/li11/tools/GATK/gatk-4.2.4.0/gatk-package-4.2.4.0-local.jar
Running:
    java -Dsamjdk.use_async_io_read_samtools=false -Dsamjdk.use_async_io_write_samtools=true -Dsamjdk.use_async_io_write_tribble=false -Dsamjdk.compression_level=2 -jar /ddn/gs1/home/li11/tools/GATK/gatk-4.2.4.0/gatk-package-4.2.4.0-local.jar GenomicsDBImport -R /ddn
/gs1/home/li11/project2017/exomeSeq/SangerWG/GRCm38_68_ref/GRCm38_68.fa --genomicsdb-workspace-path /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/testDir/PONtest/pon_db -V /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/NormalSamples/MD6831b_out
put_raw_snps_indels.vcf.gz -V /ddn/gs1/home/li11/project2022/ArunSummerSIP/NewSangleWGS/NormalSamples/MD6837b_output_raw_snps_indels.vcf.gz