timechart avg(bytes) by... not working with predict

I tried various combinations but failed 1. index="flowintegrator" src_port=21 |eval thisUser=src_ip + "="+ dest_ip | timechart avg(bytes) as volume by thisUser|predict thisUser 2. index="flowintegrator" src_port=21 |eval thisUser=src_ip + "="+ dest_ip | timechart avg(bytes) as avg_bytes by thisUser|predict avg_bytes This works but I can't predict. index="flowintegrator" src_port=21 |eval thisUser=src_ip + "="+ dest_ip | timechart avg(bytes) as avg_bytes by thisUser Help