[Arduino IDE demo source code for KC868-A32]--#07-KC868-A32_Web_server_code

[tugalsan]

do you have instsalled "esp32" board in arduino IDE?

I made a clean-up by following here
Then I extracted arudino from the zip file from here
Then I add esp32 boards by following here (link updated)
Then I selected NodeMCU-32S under the menu esp32 as below (is it answer to your question?).
   

But there is a compile error:

Code:

Using board 'nodemcu-32s' from platform in folder: C:\Users\tugal\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6
Using core 'esp32' from platform in folder: C:\Users\tugal\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6
cmd /c if exist "C:\\me\\codes\\arduino\\KinCony\\KC868-A32_Web_Server\\partitions.csv" copy /y "C:\\me\\codes\\arduino\\KinCony\\KC868-A32_Web_Server\\partitions.csv" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\partitions.csv"
cmd /c if not exist "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\partitions.csv" copy "C:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\tools\\partitions\\default.csv" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\partitions.csv"
        1 file(s) copied.
Detecting libraries used...
"C:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\xtensa-esp32-elf-gcc\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-g++" -DESP_PLATFORM "-DMBEDTLS_CONFIG_FILE=\"mbedtls/esp_config.h\"" -DHAVE_CONFIG_H -DGCC_NOT_5_2_0=0 -DWITH_POSIX "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/config" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/app_trace" "-
...
IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/fb_gfx" -std=gnu++11 -Os -g3 -Wpointer-arith -fexceptions -fstack-protector -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib -w -Wno-error=maybe-uninitialized -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-missing-field-initializers -Wno-sign-compare -fno-rtti -c -w -x c++ -E -CC -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_NodeMCU_32S -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"NodeMCU_32S\"" "-DARDUINO_VARIANT=\"nodemcu-32s\"" -DESP32 -DCORE_DEBUG_LEVEL=0 "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\cores\\esp32" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\variants\\nodemcu-32s" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\sketch\\KC868-A32_Web_Server.ino.cpp" -o nul
Alternatives for WiFi.h: [WiFi@1.0]
ResolveLibrary(WiFi.h)
  -> candidates: [WiFi@1.0]
"C:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\xtensa-esp32-elf-gcc\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-g++" -DESP_PLATFORM "-DMBEDTLS_CONFIG_FILE=\"mbedtls/esp_config.h\"" -DHAVE_CONFIG_H -DGCC_NOT_5_2_0=0 -DWITH_POSIX "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/config" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/app_trace" "-
...
IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/fb_gfx" -std=gnu++11 -Os -g3 -Wpointer-arith -fexceptions -fstack-protector -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib -w -Wno-error=maybe-uninitialized -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-missing-field-initializers -Wno-sign-compare -fno-rtti -c -w -x c++ -E -CC -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_NodeMCU_32S -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"NodeMCU_32S\"" "-DARDUINO_VARIANT=\"nodemcu-32s\"" -DESP32 -DCORE_DEBUG_LEVEL=0 "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\cores\\esp32" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\variants\\nodemcu-32s" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\WiFi\\src" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\sketch\\KC868-A32_Web_Server.ino.cpp" -o nul
Alternatives for PCF8574.h: [PCF8574 library@2.3.5]
ResolveLibrary(PCF8574.h)
  -> candidates: [PCF8574 library@2.3.5]
"C:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\xtensa-esp32-elf-gcc\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-g++" -DESP_PLATFORM "-DMBEDTLS_CONFIG_FILE=\"mbedtls/esp_config.h\"" -DHAVE_CONFIG_H -DGCC_NOT_5_2_0=0 -DWITH_POSIX "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/config" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/app_trace" "-
...
IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/fb_gfx" -std=gnu++11 -Os -g3 -Wpointer-arith -fexceptions -fstack-protector -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib -w -Wno-error=maybe-uninitialized -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-missing-field-initializers -Wno-sign-compare -fno-rtti -c -w -x c++ -E -CC -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_NodeMCU_32S -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"NodeMCU_32S\"" "-DARDUINO_VARIANT=\"nodemcu-32s\"" -DESP32 -DCORE_DEBUG_LEVEL=0 "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\cores\\esp32" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\variants\\nodemcu-32s" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\WiFi\\src" "-Ic:\\me\\docs\\Arduino\\libraries\\PCF8574_library" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\sketch\\KC868-A32_Web_Server.ino.cpp" -o nul
Alternatives for Wire.h: [Wire@1.0.1]
ResolveLibrary(Wire.h)
  -> candidates: [Wire@1.0.1]
"C:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\xtensa-esp32-elf-gcc\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-g++" -DESP_PLATFORM "-DMBEDTLS_CONFIG_FILE=\"mbedtls/esp_config.h\"" -DHAVE_CONFIG_H -DGCC_NOT_5_2_0=0 -DWITH_POSIX "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/config" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/app_trace" "-
...
IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6/tools/sdk/include/fb_gfx" -std=gnu++11 -Os -g3 -Wpointer-arith -fexceptions -fstack-protector -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib -w -Wno-error=maybe-uninitialized -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-missing-field-initializers -Wno-sign-compare -fno-rtti -c -w -x c++ -E -CC -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_NodeMCU_32S -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"NodeMCU_32S\"" "-DARDUINO_VARIANT=\"nodemcu-32s\"" -DESP32 -DCORE_DEBUG_LEVEL=0 "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\cores\\esp32" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\variants\\nodemcu-32s" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\WiFi\\src" "-Ic:\\me\\docs\\Arduino\\libraries\\PCF8574_library" "-IC:\\Users\\tugal\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\Wire\\src" "C:\\Users\\tugal\\AppData\\Local\\Temp\\arduino\\sketches\\02B740C2A58FB97419BB0D488CA3EC52\\sketch\\KC868-A32_Web_Server.ino.cpp" -o nul
Alternatives for WiFiManager.h: []
ResolveLibrary(WiFiManager.h)
  -> candidates: []
C:\me\codes\arduino\KinCony\KC868-A32_Web_Server\KC868-A32_Web_Server.ino:9:26: fatal error: WiFiManager.h: No such file or directory
compilation terminated.

Using library WiFi at version 1.0 in folder: C:\Users\tugal\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\libraries\WiFi
Using library PCF8574 library at version 2.3.5 in folder: C:\me\docs\Arduino\libraries\PCF8574_library
Using library Wire at version 1.0.1 in folder: C:\Users\tugal\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\libraries\Wire
exit status 1

Compilation error: WiFiManager.h: No such file or directory

I tried every board under the menu esp32 that has "esp32" in its name. But the error persists.