Debug Error!

[hard]

Run-Time Check Failure #2 - Stack around the variable 'X_array' was corrupted.

Hi everyone, little help needed!!! What does this error means, well basicaly the code is working but after simple calculations it says the above error message!

thank you in advance!

--:HarD:++

[ne555]

Completely blind guess. Out of Bounds

[hard]

made a silly mistake in a for loop, started from i=1! changed to i=0 :)
thanks anyway!