Live Cycle Designer PDFs won't send over email

I recently created a few PDF forms using Live Cycle Designer, but when I went to distribute them via e-mail I ran into an issue. Every time I attached a PDF file, it isn't recognized by gmail. I just get the message below. It's only the Live Cycle Designer files - other PDFs send just fine. I tried updating my Live Cycle software, downloaded the new version of Reader, re-started the computer, etc. but nothing works. Help!
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Please check the Target Version of the Reader in the LiveCycle designer for the pdf.
Also, Check which version of Adobe reader your browser is using.
Sometimes even if the system is using the latest version, the browser version is different.
Also, you can check the below mentioned url for more details.
Can't view PDF on the web
Let me know if this helps.