rman error

I have the following script for 8i RMAN. I am getting errors to run backup.
run {
allocate channel ch1 type 'sbt_tape'
PARMS="BLKSIZE=262144,ENV=(CV_mmsApiVsn=2,CV_channelPar=ch1)"
TRACE 0;
setlimit channel ch1 maxopenfiles 8;
backup archivelog all delete input ;

backup current controlfile;

RELEASE CHANNEL ch1;
}

error

RMAN-03022: compiling command: XCHECK
RMAN-03026: error recovery releasing channel resources
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: XCHECK
RMAN-06091: no channel allocated for maintenance (of an appropriate type)
dba1234Asked:
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Mark GeerlingsDatabase AdministratorCommented:
Did this command run successfully in the past, and now it it is giving the error?  Or, are you trying to get this to work for the first time?  Are you aware that Oracle8i has been unsupported for many years?  Do you have the option of upgrading to Oracle11?

Rman was new in Oracle8i and it had a number of problems then.  In later versions of Oracle it works better.
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