Creating a new ObjectClass and Attribute in openLDAP

I am new at LDAP and searched for adding simple objectClass and Attributes but still getting an error, I would like to have an object 'adminFunc' with a simple string attribute 'functionId' so I copied adminFunc.schema and adminFunc.ldif to the schema folder:

adminFunc.schema:

objectidentifier adminFuncSchema 1.3.6.1.4.1.X.Y
objectidentifier funcAttrs adminFuncSchema:3
objectidentifier funcClass adminFuncSchema:4

attributetype ( funcAttrs:2
  NAME 'functionId'
  EQUALITY caseIgnoreMatch
  SUBSTR caseIgnoreSubstringsMatch
  ORDERING caseIgnoreOrderingMatch
  SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{255} )  

objectclass ( 
  funcClass:1
  NAME 'adminFunc'
  DESC 'Admin permission'
  SUP ( top ) AUXILIARY
  MAY functionId )

adminFunc.ldif: ( which has been generated automatically by running slaptest )

dn: cn=adminFunc
objectClass: olcSchemaConfig
cn: adminFunc
olcObjectIdentifier: adminFuncSchema 1.3.6.1.4.1.X.Y
olcObjectIdentifier: funcAttrs adminFuncSchema:3
olcObjectIdentifier: funcClass adminFuncSchema:4
olcAttributeTypes: ( funcAttrs:2 NAME 'functionId' EQUALITY caseIgnoreMat
 ch ORDERING caseIgnoreOrderingMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX
  1.3.6.1.4.1.1466.115.121.1.15{255} )
olcObjectClasses: ( funcClass:1 NAME 'adminFunc' DESC 'Admin permission' 
 SUP top AUXILIARY MAY functionId )
structuralObjectClass: olcSchemaConfig
entryUUID: c43389f4-0bfb-1037-959b-c9dc976d6fc3
creatorsName: cn=config
createTimestamp: 20170802182555Z
entryCSN: 20170802182555.047279Z#000000#000#000000
modifiersName: cn=config
modifyTimestamp: 20170802182555Z

modify.ldif my dn is ou=Local,ou=SV,dc=example,dc=com

trying to run this command to create a new Call_Center object:

ldapmodify -x -W -D "cn=ldapadmin,dc=example,dc=com" -f modify.ldif

dn: cn=Call_Center,ou=Local,ou=SV,dc=example,dc=com
changetype: add
objectClass: top
objectClass: adminFunc
cn: Call_Center
functionId: 1010

But can't find my adminFunc object:

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
adding new entry "cn=Call_Center,ou=Local,ou=SV,dc=example,dc=com"
ldap_add: Invalid syntax (21)
       additional info: objectClass: value #1 invalid per syntax

Not sure what am I missing.

Thanks