# Fix: Phantom Shape
## The Problem | Phantom Shape in Block
The most common error that throws off your fabric calculations is when a shape in your block is hiding behind layers or is completely outside the block area.
Even though these shapes are hidden, the PreQuilt Fabric Calculator will give you calculations for them and consequently the amount of fabric you need will be inaccurate.
This often results in being told you need more fabric than you do.
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## YouTube Video
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## Help Guide
### The Problem
In this example, the **Continental** block is throwing an Error Warning in the Fabric Calculator.
### Problem Analysis
Let's investigate what is causing the error. To do this:
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{% step %}
In the design application, click on **Edit Block** for the Sashing quilt block.
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At first glance we cannot see this teal HST shape, which makes sense since it's throwing the error.
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Click on the **LAYERS tab** at the top of the left side control panel.
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Once expanded, we can see all the shapes on individual layers. Using the thumbnail on the left side, we can try and find our phantom shape. You can also start to hide the other shapes to try and uncover the phantom shape.
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Here we can see that it's most likely this teal HST that has just the tip of the shape visible under many layers.
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### Fix the Error & Fabric Calculations
{% stepper %}
{% step %}
In the design application, click on **Edit Block** for the Sashing quilt block.
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{% step %}
Click on the **LAYERS tab** at the top of the left side control panel.
{% endstep %}
{% step %}
Click on the phantom shape's layer and drag it to the top of the list. We can now see it on the Block Editor space.
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Click on the **Delete** button in the shape's layer.
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You will now see the shape has been removed from the quilt block.
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Click on the **Save to Quilt** button in the top right corner.
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{% step %} **Save** the quilt () and click on the **Fabric Calculator** button ().
{% endstep %}
{% step %}
The error is now gone and the fabric calculations are corrected.
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{% endstepper %}
