Traffic estimate is too large
Webmaster traffic field exceeded the maximum allowed estimate (webmaster-site-input).
Why this happens
Huge number pasted into traffic. Distinct from Enter a valid traffic estimate (non-numeric/negative).
Diagnose and fix
1. Enter a smaller, realistic estimate (digits only).
2. Leave blank if the field is optional.
3. Retry add site.
4. See Could not add website.