The correct answer might depend upon several things according to the RapidDriver Edition.
RapidDriver Demo Version
| · | The evaluation period for this installation of RapidDriver has expired.
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| · | You must keep RapidDriver application running to evaluate the RapidDriver Developer functionality.
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| · | The driver was not installed. Make sure that your device appears under the RapidDriver Devices class (*) branch of Device Manager and has no problems.
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RapidDriver Explorer
| You can not create any application with RapidDriver Explorer. You should upgrade your RapidDriver license to the either of Developer or Source Builder editions.
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RapidDriver Developer or RapidDriver Source Builder
| · | You should install the "bus-specific" driver (RapidIsa.sys, RapidPci.sys, RapidUsb.sys, or RapidLpt.sys) instead of "universal" RapidDriver.sys.
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| · | Make sure that appropriate DLL exist in <Windows>\System directory and appropriate driver exist in <Windows>\System32\Driver directory.
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| · | The driver was not installed. Make sure that your device appears under the RapidDriver Devices (*) class branch of Device Manager and has no problems.
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| · | Wrong "instance number" in OpenRapidXXX() function.
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(*) RapidDriver Devices are marked by the RapidDriver icon in Device Manager, see picture:
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