Budget limited or exhausted...

The other day I tried out promoting a CPA offer on Adwords and I did about 40 clicks in a day on part of a voucher, so I opened up a new account with a voucher and used the exact same settings, keywords, budget, etc. as my other campaign, but now my ads refuse to run because of a "limited or exhausted" budget according to keyword diagnosis?

What in the world does that mean? How am I supposed to advertise with a voucher if Google thinks I'm spending too much or too little?

I realize competition changes daily, but I've tried raising the budget, lowering it, raising my CPC, lowering my CPC, toggling manual/auto bids, etc.

Anyone know of anything I can try to make Google run my ads? I have many more campaigns to try out and I don't want to go through all this trouble every time.

Typically this will mean that your daily budget is very low as compared to the amount of traffic that your keywords are capable a of delivering - and the cost of potential clicks as defined by your Max CPC setting.

these are some reply i find on adwords forum ,

This is the possible implication of having control over your daily costs- you may limit the visibility of your ads. The options that you have are: Effectively optimize your bids, Maintain good Ad Quality (better Quality Score) other than just controlling your Daily Budget. Read more about these options here and take the appropriate decision.

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"Budget limited" usually means you have a high CPC bid in comparison to your daily budget. For example, if your CPC bid is $4 and your daily budget is $10, Google may not be able to show your ad without risking going over the 20% over-delivery limit after getting only one click.

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It usually means withing the past 14 days you have hit your budget and you missing clicks. Not that you did that day.