# MapView data type not found

**URL:** <https://forums.fusetools.com/t/mapview-data-type-not-found/2702>\
**Category:** Bug Reports\
**Created:** [January 18, 2017, 12:58pm UTC](https://forums.fusetools.com/t/mapview-data-type-not-found/2702 "2017-01-18T12:58:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TouPilsner](https://avatars.discourse-cdn.com/v4/letter/t/ecb155/32.png) [@TouPilsner](https://forums.fusetools.com/u/TouPilsner)\
**Post date:** [January 18, 2017, 12:58pm UTC](https://forums.fusetools.com/t/mapview-data-type-not-found/2702/1 "2017-01-18T12:58:09Z")

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When I try to use mapView sublime throws an error. Any help on this would be nice. By the way, is it possible to add custom markers?

“Packages”: [  
“Fuse”,  
“FuseJS”,  
“Fuse.Maps”  
],

Data type not found: MapView - C:[…]\MainView.ux(87:1):E

Object reference not set to an instance of an object. - (0:0):E

Code:

Fuse version 0.32.0  
Windows 10 x64

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<div class="post-metadata">

**Author:** ![Remi\_Pedersen](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/remi_pedersen/32/432_2.png) [@Remi\_Pedersen](https://forums.fusetools.com/u/Remi_Pedersen)\
**Post date:** [January 18, 2017, 3:31pm UTC](https://forums.fusetools.com/t/mapview-data-type-not-found/2702/2 "2017-01-18T15:31:51Z")

</div>

Try to close the preview and rebuild.  
Changes to the .unoproj are not picked up automatically (we’ll make sure this is communicated better) so the necessary packages might not have been included.

As for custom map markers you can use the IconFile property mentioned in the [docs](https://www.fusetools.com/docs/fuse/controls/mapmarker)