FCP7 pluraleyes problem!

I am having a very similar problem (or the same) that the one exposed here:
[www.lafcpug.org]

i do not understand exactly how it was solved or why did this happen (my english is not good enough)

I worked with 2 cameras and set them properly (they are correctly synced) but audio is not.

I must say that pluraleyes shows no error, but when I import the xml to FC7 i get this error,

Tue, Jan 12, 2016, 4:50 PM - Errors Found Importing Untitled 1_FCP.xml
<sequence>: <timebase> "30 fps, NTSC-rate" does not match sequence preset time base (25 fps). The <timebase> defined in the XML will be used.( line 2375 )

and in the timeline the two videos are properly synced, and audio is not.

Any ideas?