Redis递增数值-ERR value不是整数或超出范围

雷迪斯 incr set 然后使用递增 对于同一把钥匙,问题已经不存在了。为什么会这样?有什么解决办法吗?

127.0.0.1:6379[5]> incr 100
(error) ERR value is not an integer or out of range
127.0.0.1:6379[5]> incr '100'
(error) ERR value is not an integer or out of range
127.0.0.1:6379[5]> incr "100"
(error) ERR value is not an integer or out of range
127.0.0.1:6379[5]> set 100 1
OK
127.0.0.1:6379[5]> incr 100
(integer) 2

127.0.0.1:6379> get "ahmedov"
(nil)
127.0.0.1:6379> incr "ahmedov"
(integer) 1
127.0.0.1:6379> incr "ahmedov"
(integer) 2
127.0.0.1:6379> get 12.1
(nil)
127.0.0.1:6379> incr 12.1
(integer) 1
127.0.0.1:6379> get -1
(nil)
127.0.0.1:6379> incr -1
(integer) 1