Error using run_mea

[ghanaei]

Hello,
I used the example (Matlab_MEA Recording) and get run. But the bellow error happens:
“Error using run_mea (line 38)
Message: The namespace for the type ‘SampleSize’ does not exist. MATLAB requires all .NET types to be within a namespace. "
How can I solve the error in coding?
Thank you for your help.

[jesinger]

Hu ghanaei,

thanks for the report, we are looking into it.

Which version of Matlab are you using?

Peter

[ghanaei]

Hi, the version of Matlab is 2021.

[jesinger]

Hi ghanaei,

could you re-check if you update the McsUsbNet DLL to Version 5.2.3?

It is available from here: https://github.com/multichannelsystems/McsUsbNet.git

we could not re-produce the issue with that version

Please let me know if this fixes your problem

Thanks!

Peter

[ghanaei]

Hi, Thank you for your response.
I checked with the McsUsbNet DLL version ’5.2.3’, and there is no error message.

Now, I have another problem. In the example (Matlab_MEA Recording) in line ‘63’ mentioned ‘if (X=500) break % stop after 500 data packet (~ 5 second)’. However, I think it contradicts the line ‘35’.
In line ‘35’ mentioned 5000=100 ms (0.1 s) of data (a data packet). So, I think, the line ‘63’ needs to be corrected as ‘if (X=500) break % stop after 500 data packet (~ 50 second) ‘, because of 500 × 100 ms (0.1 s) = 50 second. Is it right?

Another problem is that according the above reasoning, I expect that code (with X=500) last about 50 second, but when the code runs, it takes about 17 second and stops. So, I couldn’t collect data for 50 second.
I’d appreciate it if you explain the issue.

[happypanda94]

I am also running into the same issue. I am using the 5.2.3 version, but I still get the same error. My MATLAB version is 2019b. I looked into it, and I found that the main issue is that the device instance does not seem to have anything in the ChannelBlock attribute. I went through the manuals and I at least expected a ChannelBlockNet or something similar, just like how the other attributes have something.

Can you please explain if this is the issue? I already have the 5.2.3 DLL version, but I still cannot seem to overcome this issue. How do I solve it? I would greatly appreciate if you provide me a solution.

[jesinger]

Hello, I used the example (Matlab_MEA Recording) and get run. But the bellow error happens: “Error using run_mea (line 38) Message: The namespace for the type ‘SampleSize’ does not exist. MATLAB requires all .NET types to be within a namespace. " How can I solve the error in coding? Thank you for your help.

Do you have the option to try in Visual Studio with C# or a newer Version of Matlab ?

In C# you can use it like this for example:

dacq.ChannelBlock.ReadFramesI32(i, 0, threshold, out int frames_ret)

ChannelBlock is defined as a property of type ChannelBlockNet within CMcsUsbDacqNet

and ChannelBlockNet is a class with members like AddBlocksAndChannels, ReadFramesUI16, ...

[happypanda94]

Thank you very much. I have managed to solve the issue.