ESP32 CAM Upload problem

I am trying to upload the CameraWebServer to my ESP32 CAM board.  Compile is successful, and upload starts, but none of several attempts runs to completion.  Here's the error messages:

Arduino: 1.8.9 (Windows 7), TD: 1.53, Board: "AI Thinker ESP32-CAM, 240MHz (WiFi/BT), QIO, 80MHz"

Sketch uses 263394 bytes (8%) of program storage space. Maximum is 3145728 bytes.
Global variables use 13484 bytes (4%) of dynamic memory, leaving 314196 bytes for local variables. Maximum is 327680 bytes.
esptool.py v3.0-dev
Serial port COM9
Connecting....
Chip is ESP32-D0WD (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: a4:e5:7c:d5:49:70
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 460800
Changed.
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 8192 bytes to 47...
Writing at 0x0000e000... (100 %)
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.0 seconds (effective 2730.7 kbit/s)...
Hash of data verified.
Compressed 18656 bytes to 12053...
Writing at 0x00001000... (100 %)
Wrote 18656 bytes (12053 compressed) at 0x00001000 in 0.3 seconds (effective 502.5 kbit/s)...
Hash of data verified.
Compressed 263504 bytes to 123166...
Writing at 0x00010000... (12 %)
Writing at 0x00014000... (25 %)

A fatal error occurred: Failed to write compressed data to flash after seq 1 (result was C100)
A fatal error occurred: Failed to write compressed data to flash after seq 1 (result was C100)

Can anyone suggest what the problem is?