Unterminated format specifier exception keeps occuring and I don't know why.

[Enjoys Math via Digitalmars-d-learn]

On Sunday, 31 January 2016 at 19:40:15 UTC, Enjoys Math wrote:
> This weird exception keeps occuring and visual D is not 
> bringing me to the place in my code that might be calling it.
>
> [...]

The exception is not listed in the Exception Settings checkable 
list.   I will try commenting out the D source code that throws 
it.