Geotiff

I am having issues when I try to load Geotiffs. I have tried using a fixed or variable parameter type, and I have also tried defining a 2d array in the equation box, but whenever I try to load the values in, I get a number of errors, one of which is that /node00000/var2 at indices 0 the following problem occurred: Missing value (this repeats at various indices through the data). Also there are other errors about 0 appearing twice as time. The data is just meant to be loaded in as a 2-d array, it is not supposed to change through time. Do you know what the issue is?

Thanks