We are attempting to migrate a set of syncing scripts from FME version 2014 to the latest FME version 2019 at the customer's premises.
In one of the first steps, FME is stopping with the message: MSSQL_SPATIAL reader: An unknown exception occurred (log in attachment ).
In 32 bit version, FME Desktop goes out of memory, while using 64 bit version, the memory usage is high, but apparently still workable.
On a hunch I would try removing the existing reader and adding it again. 2014 to 2019 is quite a big step so that may have something to do with it.
Your memory (6 Gb) is indeed on the low side and below the minimum specs as listed by Safe, consider expanding that if you have the option. It's hard to say whether that is the cause of this error, but more memory (and more disk space for temp files) wouldn't hurt.