Error: Time values must be monotonically non-decreasing

I am trying to load ECG signals in simulation for further processing, but i am getting this error. I checked others solutions but they are not fitting in my case.

[KSSV]

Show us the code so that people can help...

[John D'Errico]

Exactly. All we know so far is that you have made a mistake. But show more than just the code. It is usually necessary for you to provide the data that went into using the code. So either plot the data, or provide it as a .mat file attached to a comment.

[Adam]

Surely the error is about as self-explanatory as they come?! Check your data, look at its time values and do whatever is required to make them non-decreasing.