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IDW procedure - Invalid output extent (after working fine)

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Dear anyone who would be so kind to help!

I'm having an issue with using the IDW procedure in ArcMap 10.0. I've been using the IDW tool to create a distance-decay trend map from mean center points. The data is joined to a series of mean center points (for European regions) and then IDW performed on these mean center points - with a Z value of GDP or HDI etc.

This worked fine twice - for an Index and Pop density - but then has suddenly started giving me 010092: Invalid output extent errors. I then changed the processing extent to a variety of things (same as display, same as layer x, as specified below). All this did was change the error to 010024: Error during conversion! I have no idea what the sudden issue is. All the settings were the same, and even for the same variables - index and pop density - it works no longer.

Please help, it's for my dissertation!

Kind Regards,
Henry Carroll.

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