query error after ddl operation

[renyuxing1]

After I have executed the following two ddl statements，Some query statements begin to report errors.When I delete the two attributes, the query is normal again
ddl：ALTER TAG Ngssign ADD (xm_sign string NOT NULL COMMENT '小蜜标记') ;
ALTER TAG Ngssign ADD (xm_sign_rem string NOT NULL COMMENT '小蜜标记备注');
error:

my nebula version is 3.1.0
tag 5000,00000
edge 7000,0000