My 3ds keeps saying an error has occurred hold down the power and try agian. How do i fix this

SOURCE: r4 card just says loading in my ds and sd card works on other r4

Try re-loading the frimware on the SD card or loading a newer version. I have found that some firmware does not work on some R4 cards. Has this R4 ever worked? Also inspect the R4 for damage, my nephews R4 wasn't working and the problem was a bite mark on the unit

SOURCE: R4: An error has occured

The DSi has a firewall. The DSi blocks your card. Not a new SD, but a new R4, mate.

SOURCE: when i insert my R4i for DSi card, it start to say

it says the same to me to ppl what could i do please help me

SOURCE: When I insert my R4i card for DSi and select start

What firmware is your DSi using? If you recently updated to v1.4 then it will prevent your R4i from working. Luckily hackers have released their own firmware to fix this problem. Try updating your firmware
http://www.wiilovemario.com/R4DS-Guide

SOURCE: I put my R4i gold card in the slot but it just

Since your actually not supposed to use the gold card according to the government the dsi might be a stubborn one and the gold card info cant get through or your gold card might be faulty. The most foolproof solution is to get a R4i sdhc in a red box. Then again you can try blowing into the card insert or blowing into the sandisk slot.

Good luck! :)