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Can't reload 'C:\Program Files\MATL​AB\R2018b\​bin\win64\​ocv.dll'

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was on 9 Oct 2018
Answered: reza moradi on 1 Mar 2020
When I run the function vision.PointTracker, I get the error message: Can't reload 'C:\Program Files\MATLAB\R2018b\bin\win64\ocv.dll'. I already reinstalled matlab, but that did not solve my problem. I use Matlab R2018b. On my other laptop with R2018a, I do not get the error message. What can I do to solve the error?


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Walter Roberson
Walter Roberson on 12 Oct 2018
Amith: if you go through the numerous "can't reload (windows)" you will see a fair number in which Dell were not being used.
The Simulink cases are potentially different from the other cases.
When I did the tagging I had hoped that there had been a solution posted that I had overlooked, or alternatively that there was enough in common in the cases to make a good hypothesis, but I did not find anything useful except a hint that there might be a cause for one of the Simulink cases.
Amith Kamath
Amith Kamath on 15 Oct 2018
Thanks for your note, Walter! I have not been able to reproduce this on a Windows 7 SP1 machine (which I know is not a Dell laptop). As far as I can tell, this is independent of Simulink, but I agree that there could likely be other root causes of this problem that I'm not aware of, yet.
jeyanthi selvaraj
jeyanthi selvaraj on 20 Feb 2019
I have a dell laptop with Backup and Recovery program running and i have faced the same issue

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Answers (3)

Amith Kamath
Amith Kamath on 13 Nov 2018
This happens due to the unavailability of the Visual C redistributable DLLs, which can be downloaded from here:
For more details about what changed, see the following:
Upon the installation, restarting MATLAB should resolve this problem. Please report back here if the problem persists in spite of installing this. Thanks!


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salisu on 15 Sep 2019
I have similar problem please help me with your email. thank you.
SAHIL SETHI on 4 Jan 2020
Dear Unner Sajid,
I am facing issues installing C redistruable DLLs.
Can you extend your support to me.
Your efforts will be highly appreciated.
Thanks & regards,
Walter Roberson
Walter Roberson on 4 Jan 2020
In I linked to the current Microsoft document on where to download the redistributable appropriate for your operating system and the Visual Studios version in use. What difficulty did you encounter when you installed? Which operating system are you using, and which MATLAB release are you using?

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shrisha HS
shrisha HS on 5 Nov 2018
Edited: shrisha HS on 5 Nov 2018
I am trying to run "Depth Estimation From Stereo Video". Installed Computer Vision tool box on a trial basis. i get " Can't reload 'C:\Program Files\MATLAB\R2018b\bin\win64\ocv.dll'"
error looks like this
Can't reload 'C:\Program Files\MATLAB\R2018b\bin\win64\ocv.dll'
Error in disparity (line 211) disparityMap = ocvDisparitySGBM(I1_u8, I2_u8, optSGBM);
Error in CNN1 (line 27) disparityMap = disparity(frameLeftGray, frameRightGray);
CNN1 is file name Windows 7 64 bit Toshiba satellite C850 laptop, R2018b


Walter Roberson
Walter Roberson on 5 Nov 2018
Unfortunately we do not know what caused this. Mathworks support might have figured it out so you should open a case for this.
shrisha HS
shrisha HS on 10 Nov 2018
i ran "restoredefaultpath" this is what i get
System error: Command executed: "C:\Program Files\MATLAB\R2018b\sys\perl\win32\bin\perl.exe" "C:\Program Files\MATLAB\R2018b\toolbox\local\" "C:\Program Files\MATLAB\R2018b"

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reza moradi
reza moradi on 1 Mar 2020
I have same problem...I install MS Visual Studios Run Time Redistributable 2019 then resolve that
I see this resolve in :


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