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"An error occurred while uploading this sketch."? Answered

I get this error message when I try to upload button_input_led_output.ino to the ESP8266. The sketch compiles fine, it just won't upload. I've tried downloading that file and repeating the upload (after inserting the IO_USERNAME, IO_KEY, WIFI_SSID, AND WIFI_PASS, but I get the same result. hazzah_button_test.ino loads without error, and a button press lights the led. Need some help.