[Enhancement] Remove static from loadJsonConfig and unify exception strings

[yx9o]

Before Creating the Enhancement Request

• I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

Remove static from loadJsonConfig and unify exception strings.

Motivation

Remove static from loadJsonConfig and unify exception strings.

Describe the Solution You'd Like

Remove static from loadJsonConfig and unify exception strings.

Describe Alternatives You've Considered

No

Additional Context

No response