Hitting the max level of enchantment of a weapon and then disenchant it with a grindstone, if you want to enchant it again, the message is still there even though it doesn't have any enchantment
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This is normal behaviour, The same thing happens with armour. Every item has a maximum amount of anvil uses. Every time you put a weapon, tool or armour through an anvil it is taken off the total anvil usage limit until you can't put it through an anvil any more times.
If you then grind off the enchantments, the item has still hit its maximum amount of anvil uses so can no longer be re-enchanted and will display the message 'Too Expensive'. To reduce this happening in the future, make sure you combine your enchanted books in the anvil before you add them to your item. This way it reduces how many times the item has to go through the anvil, so if you need to grind off the enchantments and try again you will be more likely to get another go at it. I hope this helps.