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I'm running into a problem when trying to fit an equation that is specified with @pc or @pca. When I try using the fit command when the sample set to a single quarter or month, I get an error saying there's an overflow in the equation. Attached is a program that illustrates the problem (sometimes you have to run it twice).

EViews 9 Enterprise, 64-bit, April 27, 2015 build.

SER2 1999Q4 is equal to zero when that happens. Therefore you cannot calculate @pc(ser2) for 2000q1. Hence the error.

I just ran the program and the same thing happened when 1999Q4 was equal to 17.

Send the workfile after that run.

My apologies, the problem in the example program was indeed caused by a zero value in ser2. I'm giving up on example programs; attached is the workfile that I'm actually having problems with. If I do this:

smpl 2002m12 2002m12
core_capnet.forecast temp

I get this:
"Attempt to raise a negative number to a non integer power"

However, this works just fine:
smpl @all
core_capnet.forecast temp

When I use Eviews 8 to run the programs that stumble on this error, it works as well.

What's the build date of your copy of 9? It works for me just fine in mine.

April 27th. It works when the sample is set to 2002m12 2002m12?

Yep.