Here is a way to fix RC20 Error

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RC20 Error is Caused By Modifing cdimages.img file and Sometimes by ELS (emegensy Lighting SSystem) MOD
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First update your Video, Audio Drivers, .NET Framework and Visual C++
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Then, if You are a Windows 7 user

Go to the Task Bar You will see the Speaker ICON

Right Click and Select the Playback Devices

Then Select Proporties of the Speaker you are Currently Using

Go to Advanced Tab and Select The Audio Quality to The Maximum EX:- 192000hZ 24 Bit (Studio Quality)

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Then Right Click the GTAIV.exe and go to Compatibility Tab

Disable EveryThing Except Colours and 640 x 489 Resolution

and Enable Run as ADMINISTRATOR

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<<<<<<<<<<<<<<<<<<<<<<<<<<<  THIS WILL FIX THE 60 % of Errors >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

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IF it Still Continous to Show the RC20 Error.

Then Replace the cdimages.img file with the default file.

Then Start Importing your Mods One by One and If it has Config Scripts, Ex:- To Modify Vehicles.ide, Handling.ide and Carcols.ide

You Need to Modify these .ide files One By One and Test until it doesn't Crash

By Doing this The RC20 Error will Be Fixed

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<<<<<<<<<<<<<<<<<<<<<<<<< This Will Fix 100 % of Errors >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>