RMAN> run
2> {
3> allocate channel c1 device type disk;
4> allocate channel c2 device type disk;
5> backup incremental level 1 database plus archivelog from time 'sysdate-1' until time 'sysdate' format='f:/backup/increment/Increment_bkp_Jul31/db_%u_%p';

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "time": expecting one of: "tag"
RMAN-01007: at line 5 column 58 file: standard input