Replying to Private Message

Based on my posting I received a private message from Expert PaulaM.  I got the notification on my gmail account.   PaulaM asked me to send her my ErrorLog folder in Zip format in reply.  Not knowing, I replied to it on gmail.  It was never delivered.
Then from the 'Signin' button, I was directed to community page.  From the envelope icon, I got to the message.  I started typing reply and link to ErroLog.zip.  I clicked on review, to my dismay, I got a red bar with the following message:
Correct the highlighted error and try again
None of the users have PM enabled.  Message will not be sent.
I tried to compose a new message addressed to expert PaulaM but got the same note. None of the users...
I looked at MySettings and checked the Private Messenger Button, saved and logged out.  Got back to the community page.  Tried to reply with link to my ErrorLog.zip file.  Same road block appeared.
Help any one.