2554716 - Error during upgrade in step COMMON-DETECT-SYSTEM. Error: java.lang.NullPointerException: while trying to get the length of a null array loaded from local variable 'subDirs'.

You are running SUM to perform a Java system upgrade/update. An error occurred in step COMMON-DETECT-SYSTEM.

Error:

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An error occurred during the execution of Common System Detect of action execute.
Service com.sap.sdt.j2ee.services.servicesimpl.DetectUseCaseService failed with the following message:
msg.sysdetection.0016
For more information, see the log file .\SUM\sdt\log\SUM\COMMON-DETECT-SYSTEM_05.LOG.
Use the provided information to troubleshoot the problem. There might be a SAP note providing a solution to this problem. Search the SAP notes using the following search terms:
DETECT,execute,common-detect-system,common-detect-system,com.sap.sdt.j2ee.services.servicesimpl.DetectUseCaseService,class com.sap.sdt.util.diag.DiagException

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An error can be found in COMMON-DETECT-SYSTEM.LOG that is similar to below.

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[Error ]: The following problem has occurred during step execution: java.lang.NullPointerException: while trying to get the length of a null array loaded from local variable 'subDirs'.

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Windows Operating System.