constant array not generating code

I have a constant array that worked in matlab 2011b, but doesn't work now. I get the following error when I try to generate code:

CODEGEN(Library,System,Destination,Rate,Endianness,HtmlReport,Project,SafetyCritical,hasSynergyInfo)
Caused by:
    Error using tlc_c (line 179)
    The generated code will inline the numeric value of the expression '[GAZ GEL]' (used in parameter 'Value'
    of ('Model/Constant6') because the expression has one or more unsupported operators (see the documentation). 
	The code for this block will not use the tunable variables (GAZ (base workspace), GEL (base workspace)).

If I click on "see the documentation', I get:

 Error using helpUtils.csh.helpviewMLFactory/checkForMapFile (line 33)
Specified topic id (rtw_tunable_expr) does not exist in map file
C:\EngTools\MATLAB\R2018B\help\rtw\helptargets.map.

Error in helpview (line 213)
    help_path = factory.checkForMapFile(mapfilename, topic_id);

[Ryan Livingston]

The missing help file sounds like a possible installation issue. For that I'd suggest contacting MathWorks Technical Support:

https://www.mathworks.com/support/contact_us.html

so that someone can help troubleshoot the installation.

[Cynthia Fallon]

I don't think it's an install problem. All other help works OK.

The problem I really need fixed is the constant array [GAZ GEL] is not allowing code to be generated.

[Ryan Livingston]

That makes sense. I've made an internal note about the broken documentation link.

https://www.mathworks.com/help/rtw/ug/limitations-for-block-parameter-tunability-in-the-generated-code.html

describes the requirements for tunable parameters in generated code. Specifically, you'll notice that [] are disallowed for tunable parameters.

Possible workarounds could include:

• Save this value into something that complies with the requirements spelled out in that page
• Disable tunability on that parameter