# PLECS blockset viewer problem

**URL:** <https://forum.plexim.com/t/plecs-blockset-viewer-problem/310>\
**Category:** PLECS\
**Tags:** simulink, plecslib, plecs-blockset, licensing\
**Created:** [March 26, 2018, 3:49am UTC](https://forum.plexim.com/t/plecs-blockset-viewer-problem/310 "2018-03-26T03:49:31Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![karthik](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@karthik](https://forum.plexim.com/u/karthik)\
**Post date:** [March 26, 2018, 3:49am UTC](https://forum.plexim.com/t/plecs-blockset-viewer-problem/310/1 "2018-03-26T03:49:31Z")

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Dear Sir,

I have installed PLECS Blockset in the PC with Windows 7 Operating system. I have used the trial license.lic file when license file was asked during installation. After installing, I have started MATLAB 2017a

The following error message came when I am starting to import components from library browser: The PLECS Viewer only permits the simulation of circuits. All modifying operations of the schematics editor are disabled

The MATLAB library contains Plecs blocks in it.

How to solve this issue?

Regards,

Karthik D

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**Author:** ![wolfgang](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/wolfgang/32/7_2.png) [@wolfgang](https://forum.plexim.com/u/wolfgang)\
**Post date:** [March 26, 2018, 8:24am UTC](https://forum.plexim.com/t/plecs-blockset-viewer-problem/310/2 "2018-03-26T08:24:35Z")

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The error message indicates that a PLECS Viewer license is in fact installed on your computer. This could be a left-over from an earlier installation. A PLECS Viewer license takes precedence over any other PLECS license that you might have installed.

Please see [https://www.plexim.com/support/solutions/1008](https://www.plexim.com/support/solutions/1008) for instructions on how to locate and remove a PLECS Viewer license.

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**Author:** ![karthik](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@karthik](https://forum.plexim.com/u/karthik)\
**Post date:** [March 26, 2018, 9:52am UTC](https://forum.plexim.com/t/plecs-blockset-viewer-problem/310/3 "2018-03-26T09:52:21Z")

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Respected Wolfgang Hammer,

Thanks for the reply. The MATLAB Path PLECS Viewer problem solved.

Thanks & Regards,  
Karthik D