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You used the wrong entity name. A hanging itemframe is not called ItemFrame but item_frame.

So, the following command would work:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:writable_book,tag:{display:{Name:"Keys"}}}}

Please note: this command checks the name given to an item. You are essentially looking for a writable book that has been renamed using an anvil. If your goal is however to check for a closed book with a title you should use the following command:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:written_book,tag:[{title:Keys}][2]}}

You used the wrong entity name. A hanging itemframe is not called ItemFrame but item_frame.

So, the following command would work:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:writable_book,tag:{display:{Name:"Keys"}}}}

Please note: this command checks the name given to an item. You are essentially looking for a writable book that has been renamed using an anvil. If your goal is however to check for a closed book with a title you should use the following command:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:written_book,tag:[{title:Keys}][2]}}

You used the wrong entity name. A hanging itemframe is not called ItemFrame but item_frame.

So, the following command would work:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:writable_book,tag:{display:{Name:"Keys"}}}}

Please not this command checks the name given to an item. You are essentially looking for a writeable book that has been renamed using an anvil. If your goal is however to check for a closed book with a title you should use the following command:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:written_book,tag:{title:Keys}}}

You used the wrong entity name. A hanging itemframe is not called ItemFrame but item_frame.

So, the following command would work:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:writable_book,tag:{display:{Name:"Keys"}}}}

Please note: this command checks the name given to an item. You are essentially looking for a writable book that has been renamed using an anvil. If your goal is however to check for a closed book with a title you should use the following command:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:written_book,tag:[{title:Keys}][2]}}

Your issue is that you have invalid JSON.

Your command is almost correct, however your error is in this minor section:

id:minecraft:writable_book

The issue with this is, that it is not valid JSON. JSON is generally in the form

key:value

for simple values. In the case of special characters or spaces it should be surrounded by quotes. There is of course also arrays and object structures {...}.

In your case, the value "minecraft:writable_book" is invalid due to the fact that it contains a special character, the :.

If you however surround it with quotes, your command should work just fine.

/testfor @e[type=ItemFrame,r=10] {Item:{id:"minecraft:writable_book",tag:{display:{Name:"Keys"}}}}

You used the wrong entity name. A hanging itemframe is not called ItemFrame but item_frame.

So, the following command would work:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:writable_book,tag:{display:{Name:"Keys"}}}}

Please not this command checks the name given to an item. You are essentially looking for a writeable book that has been renamed using an anvil. If your goal is however to check for a closed book with a title you should use the following command:

/testfor @e[type=item_frame,r=10] {Item:{id:minecraft:written_book,tag:{title:Keys}}}