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Added a reference and image. To make it a more value-able answer as just: "Do this and that and it'll work" (In a vague way)
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aaa
aaa
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In my case I hadn't wired the RTS pin of the FTDI chip to a capacitor which went to the RST pin of the Arduino Pro Mini. Once I installed this connection, I no longer got the error and I was able to upload code.

Nick Gammon explains this in his forum. I've added a picture of where/how the capacitor should be placed. enter image description here

In my case I hadn't wired the RTS pin of the FTDI chip to a capacitor which went to the RST pin of the Arduino Pro Mini. Once I installed this connection, I no longer got the error and I was able to upload code.

In my case I hadn't wired the RTS pin of the FTDI chip to a capacitor which went to the RST pin of the Arduino Pro Mini. Once I installed this connection, I no longer got the error and I was able to upload code.

Nick Gammon explains this in his forum. I've added a picture of where/how the capacitor should be placed. enter image description here

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tr4nc3
tr4nc3
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In my case I hadn't wired the RTS pin of the FTDI chip to a capacitor which went to the RST pin of the Arduino Pro Mini. Once I installed this connection, I no longer got the error and I was able to upload code.