# "Requires an input" error on all filter options with vtk data file (that has data)

**URL:** https://discourse.paraview.org/t/requires-an-input-error-on-all-filter-options-with-vtk-data-file-that-has-data/8295
**Category:** ParaView Support
**Tags:** vtk
**Created:** [November 1, 2021, 12:31am UTC](https://discourse.paraview.org/t/requires-an-input-error-on-all-filter-options-with-vtk-data-file-that-has-data/8295 "2021-11-01T00:31:11Z")
**Posts on this page:** 1
**Showing post:** 3

<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 2, 2021, 8:31am UTC](https://discourse.paraview.org/t/requires-an-input-error-on-all-filter-options-with-vtk-data-file-that-has-data/8295/3 "2021-11-02T08:31:24Z")

</div>

> [@I've just opened my dataset. I can't add filters, and everything is greyed out](https://discourse.paraview.org/t/ive-just-opened-my-dataset-i-cant-add-filters-and-everything-is-greyed-out/4511):
>
> Make sure your dataset is selected in the Pipeline Browser Click apply (in the Properties tab) if the apply button is green

---

_[View the full topic](https://discourse.paraview.org/t/requires-an-input-error-on-all-filter-options-with-vtk-data-file-that-has-data/8295)._