That says you're missing a file named オブジェクト1.png. It can be found in the Charset folder in RPGMaker2000's assets. Just Copy/Paste it into Yume 2kki's Charset folder, and you should be golden.
I used the katakana table on Wikipedia's entry for katakana. There's another for hiragana, too. It takes a bit of time, but it's REALLY helpful. Also for kanji, it's a bit more difficult, but there's a website called Denshi Jisho that has a "search kanji by radicals" option if you need kanji in an error message translated.
I'm a little late to get to this one, but please read the Troubleshooting page.
In any case, the missing files from both your posts are RTP files, which I'd hazard a guess means you either didn't install the RTP or the game's throwing a fit not reading it correctly. If you did install the RTP and it's still stuffed, might wanna check the "I installed the RTP and the game still crashes" section, and either copy stuff manually or just download the rar.
EDIT: I have redone everything, I am pretty sure it should me all good now. Thank you, and I will most likely won't be posting much but if I find any other types of bugs I will report them, Goodbye.