Solution 34714: Correcting ERR: MEMORY On a TI-84 Plus C Silver Edition Graphing Calculator.
How do I correct ERR: MEMORY on a TI-84 Plus C Silver Edition graphing calculator?
An ERR: MEMORY is given when there is not enough memory to perform the instruction or function.
To increase available memory delete the contents of any variable (real or complex number, list, matrix, Y= variable, program, Apps, AppVars, picture, graph database, or string). To do this follow these steps:
1) Press [2nd] [MEM] to display the MEMORY menu.
2) Press  to access Mem Mgmt/Del.
3) Select a variable or data that needs to be deleted and press [ENTER].
4) Use [left] [right] to move the cursor next to the item, and then press [DEL]. The variable or data should now be deleted from the memory.
When deleting programs or Apps, a message asking for confirmation will appear. Select 2:Yes to continue. To leave any variable screen without deleting anything, press [2ND] [QUIT].
Please Note: With the exemption of programs and Apps, no warning will be given to verify the deletion. Some system variables, such as the last-answer variable Ans and the statistical variable RegEQ, cannot be deleted.
Please see the TI-84 Plus C Silver Edition guidebook for additional information.