Thanks Tim, but that didn't work for me. I opened a Command Window, cleaned the debug folder manually, did a folder dir, built for Debug in VS, did another folder dir, cleaned the project in VS, did another folder dir, cleaned the solution in VS, did another folder dir. Neither clean had any effect, although they both reported success in the output window: Build Clean Complete The shared cache for platform cores has been cleared. tip: Clean a project instead of a solution to preserve the shared cache. Solution Clean Complete Here's my command window: E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>REM FIRST I DELETED ALL THE CONTENTS OF THE DEBUG FOLDER E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>dir /o/s Debug Volume in drive E is Windows Volume Serial Number is 066A-8479 Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug 06/11/2021 01:24 PM <DIR> . 06/11/2021 01:24 PM <DIR> .. 0 File(s) 0 bytes Total Files Listed: 0 File(s) 0 bytes 2 Dir(s) 811,959,111,680 bytes free E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>REM THEN I DID A DEBUG BUILD IN VS 2019 E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>dir /o/s Debug Volume in drive E is Windows Volume Serial Number is 066A-8479 Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:27 PM <DIR> VM_DBG 06/11/2021 01:27 PM <DIR> WiFi 06/11/2021 01:27 PM 57,353 board.buildinfo 06/11/2021 01:27 PM 703,600 WiFiScan.bin 06/11/2021 01:26 PM 22,058 WiFiScan.cpp.d 06/11/2021 01:26 PM 884,756 WiFiScan.cpp.o 06/11/2021 01:27 PM 10,639,288 WiFiScan.elf 06/11/2021 01:27 PM 703,600 WiFiScan.ino.bin 06/11/2021 01:27 PM 10,639,288 WiFiScan.ino.elf 06/11/2021 01:27 PM 3,072 WiFiScan.ino.partitions.bin 06/11/2021 01:27 PM 3,072 WiFiScan.partitions.bin 9 File(s) 23,656,087 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\VM_DBG 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 15,542 VM_DBG.cpp.d 06/11/2021 01:26 PM 816,376 VM_DBG.cpp.o 06/11/2021 01:26 PM 271 VM_mem_check_sam.cpp.d 06/11/2021 01:26 PM 14,900 VM_mem_check_sam.cpp.o 4 File(s) 847,089 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\WiFi 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 23,338 ETH.cpp.d 06/11/2021 01:26 PM 922,696 ETH.cpp.o 06/11/2021 01:26 PM 22,893 WiFi.cpp.d 06/11/2021 01:26 PM 915,704 WiFi.cpp.o 06/11/2021 01:26 PM 23,031 WiFiAP.cpp.d 06/11/2021 01:26 PM 939,032 WiFiAP.cpp.o 06/11/2021 01:26 PM 22,293 WiFiClient.cpp.d 06/11/2021 01:26 PM 1,088,380 WiFiClient.cpp.o 06/11/2021 01:26 PM 23,353 WiFiGeneric.cpp.d 06/11/2021 01:26 PM 1,179,728 WiFiGeneric.cpp.o 06/11/2021 01:26 PM 22,616 WiFiMulti.cpp.d 06/11/2021 01:26 PM 1,020,408 WiFiMulti.cpp.o 06/11/2021 01:26 PM 23,117 WiFiScan.cpp.d 06/11/2021 01:26 PM 926,248 WiFiScan.cpp.o 06/11/2021 01:26 PM 19,247 WiFiServer.cpp.d 06/11/2021 01:26 PM 861,500 WiFiServer.cpp.o 06/11/2021 01:26 PM 23,349 WiFiSTA.cpp.d 06/11/2021 01:26 PM 970,316 WiFiSTA.cpp.o 06/11/2021 01:26 PM 19,122 WiFiUdp.cpp.d 06/11/2021 01:26 PM 894,260 WiFiUdp.cpp.o 20 File(s) 9,940,631 bytes Total Files Listed: 33 File(s) 34,443,807 bytes 8 Dir(s) 811,924,586,496 bytes free E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>REM THEN I DID Build->Clean WifiScan in VS E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>dir /o/s Debug Volume in drive E is Windows Volume Serial Number is 066A-8479 Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:27 PM <DIR> VM_DBG 06/11/2021 01:27 PM <DIR> WiFi 06/11/2021 01:27 PM 57,353 board.buildinfo 06/11/2021 01:27 PM 703,600 WiFiScan.bin 06/11/2021 01:26 PM 22,058 WiFiScan.cpp.d 06/11/2021 01:26 PM 884,756 WiFiScan.cpp.o 06/11/2021 01:27 PM 10,639,288 WiFiScan.elf 06/11/2021 01:27 PM 703,600 WiFiScan.ino.bin 06/11/2021 01:27 PM 10,639,288 WiFiScan.ino.elf 06/11/2021 01:27 PM 3,072 WiFiScan.ino.partitions.bin 06/11/2021 01:27 PM 3,072 WiFiScan.partitions.bin 9 File(s) 23,656,087 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\VM_DBG 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 15,542 VM_DBG.cpp.d 06/11/2021 01:26 PM 816,376 VM_DBG.cpp.o 06/11/2021 01:26 PM 271 VM_mem_check_sam.cpp.d 06/11/2021 01:26 PM 14,900 VM_mem_check_sam.cpp.o 4 File(s) 847,089 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\WiFi 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 23,338 ETH.cpp.d 06/11/2021 01:26 PM 922,696 ETH.cpp.o 06/11/2021 01:26 PM 22,893 WiFi.cpp.d 06/11/2021 01:26 PM 915,704 WiFi.cpp.o 06/11/2021 01:26 PM 23,031 WiFiAP.cpp.d 06/11/2021 01:26 PM 939,032 WiFiAP.cpp.o 06/11/2021 01:26 PM 22,293 WiFiClient.cpp.d 06/11/2021 01:26 PM 1,088,380 WiFiClient.cpp.o 06/11/2021 01:26 PM 23,353 WiFiGeneric.cpp.d 06/11/2021 01:26 PM 1,179,728 WiFiGeneric.cpp.o 06/11/2021 01:26 PM 22,616 WiFiMulti.cpp.d 06/11/2021 01:26 PM 1,020,408 WiFiMulti.cpp.o 06/11/2021 01:26 PM 23,117 WiFiScan.cpp.d 06/11/2021 01:26 PM 926,248 WiFiScan.cpp.o 06/11/2021 01:26 PM 19,247 WiFiServer.cpp.d 06/11/2021 01:26 PM 861,500 WiFiServer.cpp.o 06/11/2021 01:26 PM 23,349 WiFiSTA.cpp.d 06/11/2021 01:26 PM 970,316 WiFiSTA.cpp.o 06/11/2021 01:26 PM 19,122 WiFiUdp.cpp.d 06/11/2021 01:26 PM 894,260 WiFiUdp.cpp.o 20 File(s) 9,940,631 bytes Total Files Listed: 33 File(s) 34,443,807 bytes 8 Dir(s) 811,924,586,496 bytes free E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>REM THEN I DID Build->Clean Solution in VS E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>dir /o/s Debug Volume in drive E is Windows Volume Serial Number is 066A-8479 Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:27 PM <DIR> VM_DBG 06/11/2021 01:27 PM <DIR> WiFi 06/11/2021 01:27 PM 57,353 board.buildinfo 06/11/2021 01:27 PM 703,600 WiFiScan.bin 06/11/2021 01:26 PM 22,058 WiFiScan.cpp.d 06/11/2021 01:26 PM 884,756 WiFiScan.cpp.o 06/11/2021 01:27 PM 10,639,288 WiFiScan.elf 06/11/2021 01:27 PM 703,600 WiFiScan.ino.bin 06/11/2021 01:27 PM 10,639,288 WiFiScan.ino.elf 06/11/2021 01:27 PM 3,072 WiFiScan.ino.partitions.bin 06/11/2021 01:27 PM 3,072 WiFiScan.partitions.bin 9 File(s) 23,656,087 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\VM_DBG 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 15,542 VM_DBG.cpp.d 06/11/2021 01:26 PM 816,376 VM_DBG.cpp.o 06/11/2021 01:26 PM 271 VM_mem_check_sam.cpp.d 06/11/2021 01:26 PM 14,900 VM_mem_check_sam.cpp.o 4 File(s) 847,089 bytes Directory of E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan\Debug\WiFi 06/11/2021 01:27 PM <DIR> . 06/11/2021 01:27 PM <DIR> .. 06/11/2021 01:26 PM 23,338 ETH.cpp.d 06/11/2021 01:26 PM 922,696 ETH.cpp.o 06/11/2021 01:26 PM 22,893 WiFi.cpp.d 06/11/2021 01:26 PM 915,704 WiFi.cpp.o 06/11/2021 01:26 PM 23,031 WiFiAP.cpp.d 06/11/2021 01:26 PM 939,032 WiFiAP.cpp.o 06/11/2021 01:26 PM 22,293 WiFiClient.cpp.d 06/11/2021 01:26 PM 1,088,380 WiFiClient.cpp.o 06/11/2021 01:26 PM 23,353 WiFiGeneric.cpp.d 06/11/2021 01:26 PM 1,179,728 WiFiGeneric.cpp.o 06/11/2021 01:26 PM 22,616 WiFiMulti.cpp.d 06/11/2021 01:26 PM 1,020,408 WiFiMulti.cpp.o 06/11/2021 01:26 PM 23,117 WiFiScan.cpp.d 06/11/2021 01:26 PM 926,248 WiFiScan.cpp.o 06/11/2021 01:26 PM 19,247 WiFiServer.cpp.d 06/11/2021 01:26 PM 861,500 WiFiServer.cpp.o 06/11/2021 01:26 PM 23,349 WiFiSTA.cpp.d 06/11/2021 01:26 PM 970,316 WiFiSTA.cpp.o 06/11/2021 01:26 PM 19,122 WiFiUdp.cpp.d 06/11/2021 01:26 PM 894,260 WiFiUdp.cpp.o 20 File(s) 9,940,631 bytes Total Files Listed: 33 File(s) 34,443,807 bytes 8 Dir(s) 811,924,586,496 bytes free E:\_Repos\_Code\Examples\ArduinoIDE\WiFiScan>
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