Error using filterDesigner (line 85) Value must be a handle. macOS R2025b

>> filterDesigner

Error using filterDesigner (line 85)

Value must be a handle.

----

>> ver

-----------------------------------------------------------------------------------------

MATLAB Version: 25.2.0.2998904 (R2025b)

MATLAB License Number: STUDENT

Operating System: macOS Version: 26.0.1 Build: 25A362

Java Version: Java 11.0.25+9-LTS with Amazon.com Inc. OpenJDK 64-Bit Server VM mixed mode

-----------------------------------------------------------------------------------------

MATLAB Version 25.2 (R2025b)

Simulink Version 25.2 (R2025b)

Control System Toolbox Version 25.2 (R2025b)

Curve Fitting Toolbox Version 25.2 (R2025b)

DSP System Toolbox Version 25.2 (R2025b)

Global Optimization Toolbox Version 25.2 (R2025b)

Image Processing Toolbox Version 25.2 (R2025b)

Instrument Control Toolbox Version 25.2 (R2025b)

Optimization Toolbox Version 25.2 (R2025b)

Parallel Computing Toolbox Version 25.2 (R2025b)

Signal Processing Toolbox Version 25.2 (R2025b)

Simulink Control Design Version 25.2 (R2025b)

Simulink Design Optimization Version 25.2 (R2025b)

Statistics and Machine Learning Toolbox Version 25.2 (R2025b)

Symbolic Math Toolbox Version 25.2 (R2025b)

---

>> which filterDesigner -all

/Applications/MATLAB_R2025b.app/toolbox/signal/sigtools/filterDesigner.m

---

>> status = license('test', 'Signal_Toolbox')

status =

1

---

These were the tests performed and checks, in addition:

• reinstall the Signal Processing Toolbox and the DSP System Toolbox - Don't work
• I did a clean install of the complete Matlab

Even after all these tests and procedures I still get the error:

>> filterDesigner

Error using filterDesigner (line 85)

Value must be a handle.

How do I solve this problem??

[Mathieu NOE]

hello

can you share the code ?

[Rafael]

I don't have a code, it's just calling the Filter Designer app from the Signal Processing Toolbox, through the filterDesigner command, or even via the interface, the error is the same:

>> filterDesigner

Error using filterDesigner (line 85)

Value must be a handle.

This the reference page of Filter Designer

https://www.mathworks.com/help/signal/ug/introduction-to-filter-designer.html

[Mathieu NOE]

It may be time now to call the technical support

Contact Technical Support - MATLAB & Simulink

Answer 1

[Steven Lord]

Can you show us the output of these commands?

which -all sigtools.fdatool

/MATLAB/toolbox/signal/sigtools/@sigtools/@fdatool/fdatool.m  % sigtools.fdatool constructor

which -all fdatool

/MATLAB/toolbox/signal/sigtools/fdatool.m

I suspect you've installed something that would take precedence over one of those two functions.

[Rafael]

Of course, this was the result, apparently everything was correct, right?

>> which -all sigtools.fdatool

/Applications/MATLAB_R2025b.app/toolbox/signal/sigtools/@sigtools/@fdatool/fdatool.m % sigtools.fdatool constructor

>> which -all fdatool

/Applications/MATLAB_R2025b.app/toolbox/signal/sigtools/fdatool.m