FME: Microsoft SQL Native Client: Deferred prepare could not be completed.

I just ran into this error in FME:

Microsoft SQL Native Client: Deferred prepare could not be completed.

Initially, I thought that I received this error because I needed to install some SQL Server libraries, as explained on the ESRI Forums here, but then I realized that my WHERE CLAUSE in one of my FME datasource was erroneous…

Here is the error