How can I deal with error : "too many fields for object controller: mechanical ventilation"

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Did you check this post? I would suggest that you open the file using a text editor (instead of the IDF editor) and check the "Controller:MechnicalVentilation" object for any errors. You can refer to the example file 5ZoneVAV-ChilledWaterStorage-Mixed_DCV_MultiPath.idf just to see how this object is modeled!

There are very similar posts here, here, and here. I found these after searching Unmet Hours for "idf editor too many fields". Do those answer your question?

actually, I have checked this posts but I was not know the limit for additional "field Zones" that shall be added to the idd file. after trials the problem solved by adding field zones to be greater or equal as the thermal zones at my model. many thanks

@Ahmed salah feel free to post your solution of altering the IDD file so that others know that fixed your issue and can vote on it.

I have tried the solution I believe Ahmed was describing, but it did not work i.e. duplicating the final three items from the Controller:MechanicalVentilation object within the IDD file.

Starting with this code, copy/pasting and editing to create A155 through A169 in an attempt to allow 5 more zones to be controlled (creating 3 items per zone, 15 new items in the IDD):

A152,\field Zone or ZoneList 50 Name
    \type object-list
    \object-list ZoneAndZoneListNames
    \note A zone name or a zone list name may be used here