Hi Augusto,
I have seen this error before and the latest maintenance release was supposed to prevent this from happening.
The issue is that there is an older version of the sqlite.interop.dll somewhere on your system path, and this is being loaded instead of the version that ships with ReefMaster.
Could you please try the following:
1. Run a command prompt by opening the task manager, clicking the File/Run new task menu option and typing "cmd" followed by enter. At the command prompt type "where sqlite.interop.dll" and please report the result. It would also be useful if you could locate the file that is reported, and right click on it to show the version, which is shown under the "details" tab.
2. There is a workaround that should resolve the problem in the short-term (until we can resolve it properly):
Go to the ReefMaster installation directory, which by default is C:\Program Files (x86)\ReefMaster Software\ReefMaster
Inside this directory is a directory called x64, and inside this directory is the correct, 64 bit version of sqlite.interop.dll. Copy this file and paste it into the C:\Program Files (x86)\ReefMaster Software\ReefMaster directory (i.e. put this dll into the same directory as the ReefMaster.exe executable). You will probably confirm administrator rights to do so - just click continue.
Restart ReefMaster and confirm that it works correctly.
Can you also confirm that you are running the latest version of ReefMaster, v1.8.30?
thanks,
Matt