Help required on Alerts PI 7.3 Dual Stack

HI Experts,

Help required configuration on Alerts...

I done below steps

1. I create a Alert Category

2. Alert Rule

3. I Configured SCOT settings

when i run the report RSALERTTEST  alert was trigger  but my INbox follows below error:

please go through the attachment for error description:

please let me know which steps  i missed?