Can't download videos from Youtube

I'm using FreeRapid Downloader 0.9u3 software to download youtube videos. I have successfully downloaded videos previously.
But now when I try to download videos it shows me an error as below,

Error - No string between "url": "and " was found

I have tried several other video downloaders also. They also didn't allow me to download videos.
Please help me to solve this problem....

Use FRD 0.9u4

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Thank you for your response. But, I have used FRD 0.9u4 also. Same error occurs.

Make sure you have the latest version of the plugin (Help > Check for plugin updates). Note that old versions of FRD do not get new plugin updates.

If it still doesn't work, please post example links.

I tried to update pluins. It was updated plugins successfully. But still the same error appears. I have attached a screenshot of if. please check it.
I'm totally confused

checking for updates with FRD 0.9u3 is a waste of time
none of the youtube plugin changes since FRD 0.9u4 will be updated.

see how_to_report_problem_with_a_plugin

Thank you soooooo much who help me to solve this problem. Now it is working.
What I did is, Downloaded FreeRapid Download 0.9u4 and updated plugins (Help -> Check for new plugins). Then it allow me download videos.
Updating plugins of FreeRapid Downloader 0.9u3 is wasting time. Thanx birchie
Thank you All...