Avamar - Oracle restore error "No backups with a label matching ''

The Restore operation is slow and may eventually fail with errors similar to the following:
 

avtar Error <5183>: No backups with a label matching '' or backuptag 'c-555-444-ff' or labelnum 0 were found.
avtar Error <5920>: File 12/remsdev/CONTROLFILE.remsdev.c-555-444-ff not found.

Restoring using autobackup means that the Oracle software may possibly make numerous queries to Avamar.
If there are more than 255 such queries and each query lasts approximately one minute, this slows the restore process considerably.

Example:

restore spfile to '/oracle/admin/remsdev/avamar/spfileremsdev.ora' from autobackup;

The best way to restore the spfile or controlfile is by using its actual name instead of autobackup, like this:
 

run {
allocate channel c1 type sbt PARMS="SBT_LIBRARY=/usr/local/avamar/lib/libobk_avamar64.so" format '%d_%U';
send channel c1 '"--prefix=12/remsdev/CONTROLFILE.remsdev." "--flagfile=/oracle/admin/remsdev/avamar/my-avtar-flags.txt" "--bindir=/usr/local/avamar/bin"';
restore spfile to '/oracle/admin/remsdev/avamar/spfileremsdev.ora' from  CONTROLFILE.remsdev.c-12345-6789-01 ;
release channel c1;