HI,

If you switch on tools>visual micro>verbose messages that should show where the SoftwareSerial is being resolved. Please post the output after switching it on and compiling.

Does the arduino ide show the same issue?

Thanks

Looks like there's an issue with attaching .txt files. I'm inserting the Visual Studio output here:

Core Include Paths
Include Path 'C:\Arduino\arduino-1.0.6\hardware\arduino\cores\arduino'
Include Path 'C:\Arduino\arduino-1.0.6\hardware\arduino\variants\standard'
Library Include Paths (2)
Include Path 'C:\Arduino\arduino-1.0.6\libraries\Wire'
Include Path 'C:\Arduino\arduino-1.0.6\libraries\SFE_ISL29125_Library'
Platform Libraries Root Include Paths
Include Path 'C:\Arduino\arduino-1.0.6\libraries'
Include Path 'C:\Arduino\arduino-1.0.6\hardware\arduino\libraries'
Include Path 'C:\Program Files (x86)\Visual Micro\Visual Micro for Arduino\Micro Platforms\default\debuggers'
Include Path 'C:\Users\donnmo\Documents\Arduino\libraries'
C:\Arduino\arduino-1.0.6\hardware\tools\avr\bin\avr-g++ -c -g -Os -fno-exceptions -ffunction-sections -fdata-sections -Wall -mmcu=atmega328p -DF_CPU=16000000L -MMD -DUSB_VID=null -DUSB_PID=null -DARDUINO=106 -I"C:\Arduino\arduino-1.0.6\hardware\arduino\cores\arduino" -I"C:\Arduino\arduino-1.0.6\hardware\arduino\variants\standard" -I"C:\Arduino\arduino-1.0.6\libraries\Wire" -I"C:\Arduino\arduino-1.0.6\libraries\SFE_ISL29125_Library" -I"C:\Arduino\arduino-1.0.6\libraries" -I"C:\Arduino\arduino-1.0.6\hardware\arduino\libraries" -I"C:\Program Files (x86)\Visual Micro\Visual Micro for Arduino\Micro Platforms\default\debuggers" -I"C:\Users\donnmo\Documents\Arduino\libraries" -o "C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328\RGB.cpp.o"  "C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328\RGB.cpp" 
C:\Arduino\arduino-1.0.6\hardware\tools\avr\bin\avr-gcc -Os -Wl,--gc-sections -mmcu=atmega328p -L"C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328" -o "C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328\RGB.elf" "C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328\RGB.cpp.o" .o" twi.c.o" Library\SFE_ISL29125.cpp.o" "C:\Users\donnmo\AppData\Local\VMicro\Arduino\Builds\RGB\atmega328\core.a" -lm
RGB.cpp.o:In function `__static_initialization_and_destruction_0'
RGB.ino:SoftwareSerial(unsigned char, unsigned char, bool)'
RGB.ino:~SoftwareSerial()'
Error creating .elf

I just did a "clean" and then a "build". Output in the attached .txt file.

Thanks!

Well, I'm not sure what happened; but, I'm no longer seeing the error. 

I'd shut down Visual Studio, re-installed the Arduino IDE, and tested the .ino in the Arduino IDE. It worked. 

After the notification arrived that you'd responded, I re-opened visual studio, did a "clean", and then a "build". And, it built without the error.

Still not sure how the issue was resolved...but, it appears that I'm up and running.

Sincerely appreciate the help!