Error generating effect styles

[Mastersam07]

Describe the bug
Tried generating effect styles from this design and got bad names like 1pxFocusRingEffect0.

To Reproduce
Steps to reproduce the behavior:

1. Go to the design
2. Activate the plugin
3. Generate effectstyles
4. See error

Expected behavior
Effects with proper names .

Suggestion
Cases where names start with some other character not an alphabet, move to the end of the name.