How can I fix this issue? the 1099-R is showing: "You must fix errors on this page before continuing." even though I am sure I entered the exact values.

You can contact TurboTax Live and an agent can look at your return with you to resolve the issue or you can delete the form 1099-R from your return and enter the information again. 

If you do not understand why there is an error by deleting the form and putting in the information again it may resolve the issue.

Link to How To Delete A Form in TurboTax

I've seen this issue before. The only way I've ever seen it dealt with successfully is if you completely delete the 1099-R from the program, then finish working through the section and clicking the DONE button to be returned to the master income screen. Then elect to start/update the rentirement income section again and enter the 1099-R anew.

My guess is that there is no amount in box 16 (state distribution).   Use the same amount you see in Box 1 and Box 2 (prob the same amounts) and that might solve the issue.  If boxes 1 and 2 are different, I would use Box 2