# Error: No image data in input volume #0

**URL:** <https://discourse.slicer.org/t/error-no-image-data-in-input-volume-0/11715>\
**Category:** Support\
**Created:** [May 26, 2020, 4:07pm UTC](https://discourse.slicer.org/t/error-no-image-data-in-input-volume-0/11715 "2020-05-26T16:07:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TomNB](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@TomNB](https://discourse.slicer.org/u/TomNB)\
**Post date:** [May 26, 2020, 4:07pm UTC](https://discourse.slicer.org/t/error-no-image-data-in-input-volume-0/11715/1 "2020-05-26T16:07:10Z")

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Hello,

I have CT images of the plastic water phantom loaded for orthovoltage dose calculation. The same images were used by my colleagues last year. Surprisingly, I get this error **Error: No image data in input volume #0** when I try to calculate the dose similar to what my colleagues did.

Anyone aware of what might be the reason for this error.

Thank you,

Tom

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [May 26, 2020, 4:21pm UTC](https://discourse.slicer.org/t/error-no-image-data-in-input-volume-0/11715/2 "2020-05-26T16:21:00Z")

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Based on the error message the selected reference image is invalid. Make sure you select it and that it is the right one.