# Error in reading input image information in Demons Registration at ImageIO

**URL:** <https://discourse.itk.org/t/error-in-reading-input-image-information-in-demons-registration-at-imageio/2247>\
**Category:** Uncategorized\
**Created:** [September 18, 2019, 1:55pm UTC](https://discourse.itk.org/t/error-in-reading-input-image-information-in-demons-registration-at-imageio/2247 "2019-09-18T13:55:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![EE18D504\_SINDHURA\_C](https://discourse.itk.org/letter_avatar_proxy/v4/letter/e/b3f665/32.png) [@EE18D504\_SINDHURA\_C](https://discourse.itk.org/u/EE18D504_SINDHURA_C)\
**Post date:** [September 18, 2019, 1:55pm UTC](https://discourse.itk.org/t/error-in-reading-input-image-information-in-demons-registration-at-imageio/2247/1 "2019-09-18T13:55:25Z")

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![image](https://discourse.itk.org/uploads/default/original/1X/5ee902b4695e90408d0180e7676f1d5c25e6749c.png)

can someone tell me why it is unable to read memory?  
I have given the pixel type as float and my image is also in float data type.

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**Author:** ![mihail.isakov](https://discourse.itk.org/letter_avatar_proxy/v4/letter/m/c4cdca/32.png) [@mihail.isakov](https://discourse.itk.org/u/mihail.isakov)\
**Post date:** [September 18, 2019, 6:06pm UTC](https://discourse.itk.org/t/error-in-reading-input-image-information-in-demons-registration-at-imageio/2247/2 "2019-09-18T18:06:10Z")

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i guess `if (imageIO)` is always _true_. Try `if (imageIO.IsNotNull())` . Not sure why IO is null.

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**Author:** ![EE18D504\_SINDHURA\_C](https://discourse.itk.org/letter_avatar_proxy/v4/letter/e/b3f665/32.png) [@EE18D504\_SINDHURA\_C](https://discourse.itk.org/u/EE18D504_SINDHURA_C)\
**Post date:** [September 19, 2019, 8:33am UTC](https://discourse.itk.org/t/error-in-reading-input-image-information-in-demons-registration-at-imageio/2247/3 "2019-09-19T08:33:07Z")

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thank you sir. It worked well with .mhd files