I'm running VS2017 and Arduino IDE 1.8.5. I've looked but not found any resolution to this error. I've tried the rescan solution without success.  Any help is appreciated.   

The script is a new script with empty setup/loop functions. It should at least compile. (Other scripts do not compile either).  Compilation from Arduino IDE on other scripts that fail are OK, but VS2017 VMicro versions are not. 

The configuration finds my MonteinoMega board so I'm assuming that configuration is OK. All locations exist in the preprocess command. The VS2017 Debugger is also installed.

Error showing up is as follows:

Compiling debug version of 'VS_ISS_WxStn' for 'MoteinoMEGA'
     Preprocess: "{runtime.tools.avr-gcc.path}\bin\avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu=atmega1284p -DVM_DEBUG_BREAKPAUSE -DVM_DEBUGGER_TYPE=VM_DEBUGGER_TYPE_HARDWARESERIAL -DVM_DEBUGGER_TYPE_SERIALUSB=18 -DVM_DEBUGGER_TYPE_USBAPI=17 -DVM_DEBUGGER_TYPE_NET_UDP=16 -DVM_DEBUGGER_TYPE_HARDWARESERIAL3=15 -DVM_DEBUGGER_TYPE_HARDWARESERIAL2=14 -DVM_DEBUGGER_TYPE_HARDWARESERIAL1=13 -DVM_DEBUGGER_TYPE_CDCSerialClass=12 -DVM_DEBUGGER_TYPE_COSA=11 -DVM_DEBUGGER_TYPE_Uart=10 -DVM_DEBUGGER_TYPE_NET_CONSOLE=9 -DVM_DEBUGGER_TYPE_TTYUART=8 -DVM_DEBUGGER_TYPE_USBSERIAL=7 -DVM_DEBUGGER_TYPE_USART=6 -DVM_DEBUGGER_TYPE_UART=5 -DVM_DEBUGGER_TYPE_TEENSY=4 -DVM_DEBUGGER_TYPE_USB=3 -DVM_DEBUGGER_TYPE_FASTSERIAL=2 -DVM_DEBUGGER_TYPE_SOFTWARESERIAL=1 -DVM_DEBUGGER_TYPE_HARDWARESERIAL=0 -DVM_DEBUG_BANDWIDTH_THROTTLE_MS=100 -DVM_DEBUG_ENABLE=1 -DVM_DEBUG   -DF_CPU=16000000L -DARDUINO=10801 -DARDUINO_AVR_MOTEINOMEGA -DARDUINO_ARCH_AVR -I"C:\Users\xxx\Documents\Arduino\hardware\arduino\avr\cores\arduino" -I"C:\Users\xxx\Documents\Arduino\hardware\Moteino\avr\variants\MoteinoMEGA" noMEGA\Debug\VS_ISS_WxStn.cpp" -o "nul"
   Object reference not set to an instance of an object

I've tried rescan:
Perhaps it is a more suttle issue. I'm realatively new to VMicro, Arduino IDE and Sketches, but not to VS or C. 

IDE DropDown shows MonteinoMEGA boards below a separator line, and does not show up in the IDE board manager.

Similar issues with VMicros in VS2017. (See attached)
It shows up under Installed tab but not in the Manage Boards tab?  Is that an issue?  IDE seems to compile OK, but VMicro is more particular.

From a ZIP if I remember correctly.  How do I get it to Manager?

This board might have support, but I got zip files from here:

https://github.com/LowPowerLab/Moteino/tree/master/MEGA/Core

Oops. Sorry about that obsolete link. I know how precious time is! It's a real spaghetti trail to find the right one, but here it is.
https://github.com/LowPowerLab/Moteino/tree/master/MEGA/Core

I've also pasted the zip file in case it's needed.