I am not able to import updated metadata file after i have exported from DSpace. Please find the below mentioned error list and we are using DSpace Version 7.1.

2022-02-25 09:27:58.603 INFO metadata-import - 48 @ The script has started
2022-02-25 09:27:58.831 ERROR metadata-import - 48 @ null
2022-02-25 09:27:58.831 ERROR metadata-import - 48 @ java.lang.NullPointerException
    at org.dspace.app.bulkedit.MetadataImport.contains(MetadataImport.java:1183)
    at org.dspace.app.bulkedit.MetadataImport.compareAndUpdate(MetadataImport.java:721)
    at org.dspace.app.bulkedit.MetadataImport.runImport(MetadataImport.java:415)
    at org.dspace.app.bulkedit.MetadataImport.internalRun(MetadataImport.java:217)
    at org.dspace.scripts.DSpaceRunnable.run(DSpaceRunnable.java:104)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)