dev: tests run with errors

[shleym2000]

I built and ran "tests" in opennn/tests subdirectory using Visual Studio. Got error

...
correlations(i,j).r :: -1
type(1) :: 1
NUMERIC_LIMITS_MIN :: 1e-06
-=-=-=-=-=-
Calculating column_3 correlations.
Test 2
Calculating column_1 correlations.

C:\sandbox\x64\Release\OpenNN_tests.exe (process 67968) exited with code -1073740940.
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Attempt to run opennn\examples\forecasting also causing error

OpenNN. Forecasting Example.
Path: ../data/Pendulum.csv
Setting data file preview...
Setting rows labels...
Setting raw_variables names...
Setting raw_variables types...
Setting data dimensions...
Reading data...
Data read succesfully...
Checking constant raw_variables...
Checking binary raw_variables...
Binary raw_variables checked
Training with adaptive moment estimation "Adam" ...
Epoch: 0

C:\sandbox\x64\Release\OpenNN_Forecasting.exe (process 58860) exited with code -1073741819.