As you are Jailbroken I've moved your thread to our Hacking Section where you will receive a better response.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.
What do you mean by "failed"? Do they not open or do you get a notice that there is an error? Did you just download something before this behavior started? In other words, can you please tell us what you were doing, or what the iPad did, just before iFile and Cydia stopped working for you.