retape error

[jefflaake]

Can anyone give me guidance on what to look for with regards to the following error from MakeADFun

Error in retape() : 

  Error when reading the variable: 'TMB_epsilon_'. Please check data and parameters.

In addition: Warning message:

In retape() : Expected object. Got NULL.

It says to check data and parameters but I don't have a variable TMB_epsilon_ so not sure what to look for.  With different models, MakeADFun does run successfully. The model changes the design matrices describing the model which are part of the input data. I looked at the data list and parameter list passed to MakeADFun but there is nothing that stands out as being different and it all looked fine. Is it because there is a disagreement of types? I searched for parts of this error on the wiki and internet but came up empty. I also debugged into MakeADFun and retape but ran into the generic error message in which TMB_epsilon was a value of a variable in the message but it didn't help me work out the problem.

I realize this may not give enough info to work out what is wrong but any direction would be appreciated.

regards --jeff

[jefflaake]

Never mind.  I fell back to old-fashion debug approach of throwing out code and found the offending piece of code. Nothing to do with data and parameters. I was using an int variable index that was not declared in the code.  I had moved this code into the objective function from a separate function and in doing so forgot to copy over the declaration for index.  I thought this should have been a compile time error but apparently not. I'm "learning" more c++ one mistake at a time. I'm not certain why it ran for any model but it did.

--jeff

[Kasper Kristensen]

Seems you have encountered an unfortunate name collision. There's an integer variable 'index' declared in the objective_function class. That's why you didn't get a compilation error. Your program was actually using this internal index variable which led to the strange 'TMB_epsilon' error.

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From: tmb-...@googlegroups.com [tmb-...@googlegroups.com] on behalf of jefflaake [jeff...@gmail.com]
Sent: Tuesday, February 28, 2017 9:52 PM
To: TMB Users
Subject: [TMB users] Re: retape error

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[bolis...@gmail.com]

For anyone else: I most frequently encounter this error when I have listed a parameter in MakeADFun that is not used within the C++ code.

[Kinh Nguyen]

Another reason is you made some changes (add/rename/...) in the data/parameters and the DLL failed to unload even you did recompile and reload the model, restart the R session fixed this for me.