Running ADOP on 12.2.6 is failing at initial Validation with error “adop is not able to detect any valid application tier nodes”

Issue:

While running the “Prepare” phase in adop in R12.2.6, I encountered the below error,

Running ADOP on 12.2.6 is failing at initial Validation with error “adop is not able to detect any valid application tier nodes”
Enter the APPS password:
Enter the SYSTEM password:
Enter the WLSADMIN password:
Validating credentials…
Initializing…
Run Edition context : /u01/install/APPS/fs1/inst/apps/EBSDB_apps/appl/admin/EBSDB_apps.xml
Patch edition context: / u01/install/APPS/fs2/inst/apps/EBSDB_apps/appl/admin/EBSDB_apps.xml
*******FATAL ERROR*******
PROGRAM : (/u01/install/APPS/fs1/EBSapps/appl/ad/12.0.0/bin/adzdoptl.pl)
TIME : Thu Jul 13 02:40:38 2017
FUNCTION: ADOP::GlobalVars::_GetMandatoryArgs [ Level 1 ]
ERRORMSG: adop is not able to detect any valid application tier nodes in
ADOP_VALID_NODES table. Ensure autoconfig is run on all nodes.
[STATEMENT] Please run adopscanlog utility, using the command
“adopscanlog -latest=yes”
to get the list of the log files along with snippet of the error message corresponding to each log file. adop exiting with status = 255 (Fail)

Resolution:

I’ve shutdown the application services and ran Autoconfig on Application Tier and retried the command, which went fine with no issues.

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