Hi. I fear this will be very silly and simple, but am completely stuck!
Previously programmed several projects, using my older MacAir. Just got a new one and downloaded Arduino.
Any code, even File->Examples->Basic->Bareminimum (which is basically empty) compile fine, but won’t upload.
The LED on the ESP32866 board flashes when first connected, and the cable worked fine with the older computer and Arduino Uno boards, so i don’t think it’s the cable.
Error message says something about pyserial or esptools.
[Then it gives many errors of “Invalid Libraries” which refer to old programs stored in Dropbox. IS this because Arduino->Preferences has Sketch Locations set to ‘/Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino’?   As this was a new download, I thought it should be some normal default, but somehow it knows about the old programs.]
 
The formal Error message is:
Arduino: 1.8.13 (Mac OS X), Board: “NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200”
Executable segment sizes:
IROM : 228400 – code in flash (default or ICACHE_FLASH_ATTR)
IRAM : 26348 / 32768 – code in IRAM (ICACHE_RAM_ATTR, ISRs…)
DATA : 1248 ) – initialized variables (global, static) in RAM/HEAP
RODATA : 688 ) / 81920 – constants (global, static) in RAM/HEAP
BSS : 24840 ) – zeroed variables (global, static) in RAM/HEAP
Sketch uses 256684 bytes (24%) of program storage space. Maximum is 1044464 bytes.
Global variables use 26776 bytes (32%) of dynamic memory, leaving 55144 bytes for local variables. Maximum is 81920 bytes.
pyserial or esptool directories not found next to this upload.py tool.
An error occurred while uploading the sketch

Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.1: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.1
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/testAnalogs: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/testAnalogs
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/TestDigital: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/TestDigital
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_Test: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_Test
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.3: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.3
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.2: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Blind_control_9.2
Invalid library found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Test_Trips: no headers files (.h) found in /Users/dnfharris/Dropbox/My Mac (MacBook-Air.local)/Documents/Arduino/libraries/Test_Trips

This report would have more information with
“Show verbose output during compilation”
option enabled in File -> Preferences.
 
 
Help please!!