Add detailed error log

config.yaml
input:
  generate:
    interval: ""
    mapping: "root = {}"
    count: 1

pipeline:
  processors:
    - mapping:
        import "logic/logic1.blob"
        import "logic/logic2.blob"
        let rand num = random int (seed: timestamp_ unix nano () , min: 20, max: 40)
        root = if ($rand num < 30) J
           this. apply ("logic1")
        } else (
           this. apply ("logic2")
        }

logic/logic1.yaml
map logic1 {
  root = this.logic1.slice (0, 5)
}

logic/logic2.yaml
map logic1 {
  root = this.logic1.slice (5, 10)
}

ERRO failed assignment (line 5): failed assignment (line 2): expected array or string value, got null from field this. logic1

I have different *.blobl files, which I’m importing and then if I got any exception, it’s showing some field got null or expected array or string with line number (I may refer the same field name in multiple mappings) but not exactly in which mappings - which is difficult to find where exactly the issue is.

Reproduce the failure using config.yaml, logic/logic1.yaml, and logic/logic2.yaml, then trace how errors from the imported mappings are reported. Done means an error identifies the relevant mapping or imported file when the same field name appears in multiple mappings.