Programming problem with Tiny45

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#1
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I don't have a problem programming and reprogramming a brand new Tiny45 using a new Atmel-ICE or an AVRISP Mk2, but when I have been debugging a program, I get

Unable to connect to tool AVRISP mkII (000200150470)

and other error messages when I try to program the chip, using both the ICE and AVRISP. I think it's something to do with the fuses, and vaguely remember having this problem previously with a Dragon, but can't remember what I did. I've tried disabling DWEN and enabling the internal oscillator (no crystal), but that doesn't help.

Has anyone got any suggestions?

Leon Heller G1HSM

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I found the solution! Using debugWire, one has to select

Debug > Disable debugWire and Close.

ISP then works OK.

Leon Heller G1HSM