MS Excel – Error Message

The above shown error (As in pop up from Microsoft) is being faced by me in the form. The same happens in the cases of the table. I have noticed that it has #Error. So I attempt to fix it up by changing it. But at this moment the same error message is shown.
I have carefully noticed that even in such a case I am able to proceed and make copies of the pieces of the information into it. The information is in the table above. But at the time of my storing the data, it halts on a single point and doesn’t allow me to make any change in it.
How can I overcome this peculiar problem? My main concern is to become able to delete and make a change in it.

The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time
Please help.
