# Error adding mask during registration
**URL:** https://discourse.itk.org/t/error-adding-mask-during-registration/5605
**Category:** Engineering
**Tags:** registration
**Created:** [January 4, 2023, 9:08am UTC](https://discourse.itk.org/t/error-adding-mask-during-registration/5605 "2023-01-04T09:08:48Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@ma1282029525](https://discourse.itk.org/u/ma1282029525)
#### Post date: [January 4, 2023, 9:08am UTC](https://discourse.itk.org/t/error-adding-mask-during-registration/5605/1 "2023-01-04T09:08:48Z")
```auto
ImageMaskType::Pointer image = ImageMaskType::New();
ImageMaskType::SizeType outsize = {650,650,650 };
ImageMaskType::IndexType index = { { 0, 0, 0 } };
ImageMaskType::RegionType region;
ImageMaskType::SpacingType spacing;
region.SetSize(outsize);
region.SetIndex(index);
spacing[0] = 0.5;
spacing[1] = 0.5;
spacing[2] = 0.5;
image->SetSpacing(spacing);
image->SetRegions(region);
cout << movingImageReader->GetOutput()->GetSpacing();
image->Allocate(true); // initialize buffer to zero
ImageMaskType::RegionType insideRegion;
ImageMaskType::SizeType insideSize = { { 30, 30, 30 } };
ImageMaskType::IndexType insideIndex = { { 10, 10, 10 } };
insideRegion.SetSize(insideSize);
insideRegion.SetIndex(insideIndex);
Iterator it(image, insideRegion);
it.GoToBegin();
while (!it.IsAtEnd())
{
it.Set(itk::NumericTraits::max());
++it;
}
spatialObjectMask->SetImage(image);
spatialObjectMask->Update();
transMetric->SetMovingImageMask(spatialObjectMask);
```
This is the code I added the mask.
The image is the error message. I have checked the spacing, and I set it the same as the original image.
please help me
---
### Author:  [@ma1282029525](https://discourse.itk.org/u/ma1282029525)
#### Post date: [January 4, 2023, 9:57am UTC](https://discourse.itk.org/t/error-adding-mask-during-registration/5605/2 "2023-01-04T09:57:12Z")
transMetric-\>SetFixedImageMask(maskSO);
The error changed after I added the mask to the fixed image.
