# Error occurs when using MAT's matwrite and HDF5

**URL:** <https://discourse.julialang.org/t/error-occurs-when-using-mats-matwrite-and-hdf5/13761>\
**Category:** General Usage\
**Tags:** package\
**Created:** [August 20, 2018, 1:19pm UTC](https://discourse.julialang.org/t/error-occurs-when-using-mats-matwrite-and-hdf5/13761 "2018-08-20T13:19:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Caesar\_KG](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Caesar\_KG](https://discourse.julialang.org/u/Caesar_KG)\
**Post date:** [August 20, 2018, 1:19pm UTC](https://discourse.julialang.org/t/error-occurs-when-using-mats-matwrite-and-hdf5/13761/1 "2018-08-20T13:19:32Z")

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I’m writing mat files in a loop. The following error occurs somewhere after a few successful outputs. All the files have the same framework except for its size. But their size are also comparable.

=================================================================  
HDF5-DIAG: Error detected in HDF5 (1.8.13) thread 0:

#000: /home/abuild/rpmbuild/BUILD/hdf5-1.8.13/src/H5T.c line 1730 in H5Tcopy(): unable to register datatype atom

```
major: Datatype

minor: Unable to register new atom

```

#001: /home/abuild/rpmbuild/BUILD/hdf5-1.8.13/src/H5I.c line 895 in H5I\_register(): can’t insert ID node into skip list

```
major: Object atom

minor: Unable to insert object

```

#002: /home/abuild/rpmbuild/BUILD/hdf5-1.8.13/src/H5SL.c line 995 in H5SL\_insert(): can’t create new skip list node

```
major: Skip Lists

minor: Unable to insert object

```

#003: /home/abuild/rpmbuild/BUILD/hdf5-1.8.13/src/H5SL.c line 687 in H5SL\_insert\_common(): can’t insert duplicate key

=================================================================

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<div class="post-metadata">

**Author:** ![Caesar\_KG](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Caesar\_KG](https://discourse.julialang.org/u/Caesar_KG)\
**Post date:** [August 21, 2018, 5:05am UTC](https://discourse.julialang.org/t/error-occurs-when-using-mats-matwrite-and-hdf5/13761/2 "2018-08-21T05:05:48Z")

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Could anyone help?

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**Author:** ![carlomontec](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/carlomontec/32/2011_2.png) [@carlomontec](https://discourse.julialang.org/u/carlomontec)\
**Post date:** [August 22, 2018, 2:27pm UTC](https://discourse.julialang.org/t/error-occurs-when-using-mats-matwrite-and-hdf5/13761/3 "2018-08-22T14:27:08Z")

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I have had less glitches using MATLAB.jl to write mat files, but no idea specifically in the issue youare facing.