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I was trying to add a texture to my rectangle... This is how the problem occurred:

1: I added a new material to my rectangle

2: I added a new texture (image or movie) to my rectangle

3: I opened the texture I wanted

4: I UV unwrapped the rectangle

5: This happened:enter image description here

Does anyone know how to help?

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This isn't an error so much as it is a warning. The unwrap should have still completed (open the UV/Image Editor to check). This message just means that you have scaled the object more in one direction than others.

When you scale an object in object mode, it is not really "applied" to the object's geometry. I like to think of scaling as a modifier that is always last in the stack, whatever you do in edit mode (or most other places) is as if it was done before the object was scaled. So if you unwrap a non uniformly-scaled object it act like it was unwrapped before scaling, meaning the textures may be stretched or distorted.

To fix this just go into object mode and hit Ctrl+A > Apply Scale. This will reset all the scale values to 1 and apply the scaling to the mesh itself.

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In Object mode, press Ctrl-A and choose to apply Rotation and Scale so that the program can act on the current dimensions and rotation. After that, do your unwrap and you will be fine.

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