Just made two updates today so not sure which one breaks the compilation - lovely.

So started VS this morning and it told me there was an update to Visual Micro so I installed this.

Next thing, I remembered that there was an update to the Oak libraries, they are now at version 1.0.2 so I used the Visual Micro managed to download the new libraries.

That's when things started to go wrong.  I noticed that there was no syntax highlighting for the String and uint8_t types, odd.  Hitting the compile shortcut generated an error.  OK, might be a library problem, so go back to 1.0.1 which I know did work earlier in the week when I last rebuilt my projects.  Restart VS and I get a similar error.

I am getting the message Error compiling core in the output window.

Any advice would be welcome,
Mark

Compiler output:

Compiling 'I2CTest' for 'Oak by Digistump (Pin 1 Safe Mode - Default)'
Build folder: file:///C:/Users/Mark/AppData/Local/Temp/VMicroBuilds/I2CTest/digistump_oak1
Summary: Header=1 Prototypes=3 Imports=1
Additional Defines:
Architecture Tools: {runtime.tools.xtensa-lx106-elf-gcc.path}/bin/
Sketchbook: file:\\\Y:\SoftwareDevelopment\Arduino
Sketch Include Paths
Include Path 'Y:\SoftwareDevelopment\Arduino\I2CTest'
Core Include Paths
Include Path ores\oak'
Include Path ariants\oak1'
Library Include Paths (1)
Include Path ibraries\Wire'
All import libraries will be re-compiled
Build Core Paths: res\oak
"{runtime.tools.xtensa-lx106-elf-gcc.path}/bin/xtensa-lx106-elf-gcc" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ /tools/sdk/include" -c -g -x assembler-with-cpp -MMD -DF_CPU=80000000L -DARDUINO=10605 -DARDUINO_ESP8266_OAK -DARDUINO_ARCH_OAK -DESP8266 \cores\oak" \variants\oak1" ores\oak\cont.S" -o S.o" 
The system cannot find the file specified
	Process: "{runtime.tools.xtensa-lx106-elf-gcc.path}\bin\xtensa-lx106-elf-gcc" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ /tools/sdk/include" -c -g -x assembler-with-cpp -MMD -DF_CPU=80000000L -DARDUINO=10605 -DARDUINO_ESP8266_OAK -DARDUINO_ARCH_OAK -DESP8266 \cores\oak" \variants\oak1" ores\oak\cont.S" -o S.o" 
"{runtime.tools.xtensa-lx106-elf-gcc.path}/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ /tools/sdk/include" -c -O2 -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD -ffunction-sections -fdata-sections -DF_CPU=80000000L -DARDUINO=10605 -DARDUINO_ESP8266_OAK -DARDUINO_ARCH_OAK -DESP8266 \cores\oak" \variants\oak1" ariants\oak1\pins_arduino.cpp" -o arduino.cpp.o"
The system cannot find the file specified
	Process: "{runtime.tools.xtensa-lx106-elf-gcc.path}\bin\xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ /tools/sdk/include" -c -O2 -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD -ffunction-sections -fdata-sections -DF_CPU=80000000L -DARDUINO=10605 -DARDUINO_ESP8266_OAK -DARDUINO_ARCH_OAK -DESP8266 \cores\oak" \variants\oak1" ariants\oak1\pins_arduino.cpp" -o arduino.cpp.o"
Error compiling core 

Had to remove the library totally using the Arduino IDE and then add it back in.

I'm now back up and running - thanks for the quick turn around.

Regards,
Mark

Let me know if you need someone to test the fix.

Regards,
Mark