I am having the same error message when trying to apply for a position.
A few common reasons that may be causing hindrance when trying to log into your account include the use of a different e-mail address, having multiple accounts, cache, and cookie data that needs to be cleared.
I suggest clearing the cache and cookies on your browser or trying a separate browser to access the portal. It's also helpful to make sure that you don't have multiple accounts registered and that you are using the correct email when trying to log in.
If none of the above suggestions work, I recommend resetting your account password and ensuring that you are using the same e-mail address that was used to create your Hire account when requesting a password reset link. You can find step-by-step instructions to reset your password in the post linked below.
Trouble logging in to complete an application