Well, I don't know what that was, but it's fixed now. I uninstalled MATLAB, and installed again, but the problem persisted. Then, as a last resource, I performed a "clean uninstall" of MATLAB, as it was described on https://www.mathworks.com/matlabcentral/answers/131519-how-do-i-perform-a-clean-installation-of-matlab-on-a-windows-system#answer_138627 .
After re²installing MATLAB R2017a with the "clean uninstall", the Embedded Coder worked very well.
One thing that I noticed is that for small programs (using just a few and simple blocks), the coder does produce a CCS Project "importable" file. But for more complex builds (using several and complex blocks), it doesn't... but I'll try to figure it out later.
I'm posting this to leave a "solution" for anyone that suffers with this problem. So... that it is: a "clean uninstall" fixed it for me.
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