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"Input error: k: Format of site key was invalid" when reCAPTCHA is turned on

I had reCAPTCHA turned on in /settings/EXTERNAL_KEYS/ on my hosted site, but when people went to create new accounts, they saw the following instead of the reCAPTCHA interface:

Please read and type in the two words below to help us prevent automated account creation.
Input error: k: Format of site key was invalid

I double-checked, and I did input my reCAPTCHA exactly as it appears on my account info on http://google.com/recaptcha.

For reference, here are the keys I was using (they have since been deleted, so they won't work anymore):

  • Public Key: 6Ld7UM8SAAAAAGrn74ADTPQLi8DfYikQH3_WmkgA
  • Private Key: 6Ld7UM8SAAAAAB-pIUr_5ki8PTuWWMLDf0eYo3DX

"Input error: k: Format of site key was invalid" when reCAPTCHA is turned on

I had reCAPTCHA turned on in /settings/EXTERNAL_KEYS/ on my hosted site, but when people went to create new accounts, they saw the following instead of the reCAPTCHA interface:

Please read and type in the two words below to help us prevent automated account creation.
Input error: k: Format of site key was invalid

I double-checked, and I did input my reCAPTCHA exactly as it appears on my account info on http://google.com/recaptcha.

For reference, here are the keys I was using (they have since been deleted, so they won't work anymore):

  • Public Key: 6Ld7UM8SAAAAAGrn74ADTPQLi8DfYikQH3_WmkgA
  • Private Key: 6Ld7UM8SAAAAAB-pIUr_5ki8PTuWWMLDf0eYo3DX