Your logs shows you don't have the current version of Couatl.exe. Or, more precisely, your .err file shows an error from last week with a NEWER version of the Couatl.exe that what you are running the in LOG file which is from today.
Since it's not normally possible to get an older version when reinstalling (you said you just reinstalled), since the installers automatically downloads the most current version online, the only possible explanation is that your antivirus has mistakenly blocked the download of the current version of the Couatl.exe, so you are stuck with an older version which might not work when everything else is updated.
As explained in many other threads, you should:
- Download AND install with the antivirus TURNED OFF ENTIRELY
- BEFORE launching FSX for the first time, you have to configure the antivirus to NOT scan those files:
FSX\fsdreamteam\couatl\Couatl.exe
FSX\bglmanx.dll
Or, even better, configure it to ignore the whole FSX folder.