setup gmail account in APEX 21

I am using gmail account to send an email using APEX_MAIL, below error show in ALL_SCHEDULER_JOB_RUN_DETAILS,

# APEX|WRN|Exception in "":

# APEX|  |Error Stack: ORA-28759: failure to open file

# APEX|  |ORA-06512: at "SYS.UTL_TCP", line 63

# APEX|  |ORA-06512: at "SYS.UTL_TCP", line 314

# APEX|  |ORA-06512: at "SYS.UTL_SMTP", line 177

# APEX|  |ORA-06512: at "SYS.UTL_SMTP", line 201

# APEX|  |ORA-06512: at "APEX_210100.WWV_FLOW_MAIL", line 1031

# APEX|  |Backtrace: ORA-06512: at "SYS.UTL_TCP", line 63

# APEX|  |ORA-06512: at "SYS.UTL_TCP", line 314

# APEX|  |ORA-06512: at "SYS.UTL_SMTP", line 177

# APEX|  |ORA-06512: at "SYS.UTL_SMTP", line 201

# APEX|  |ORA-06512: at "APEX_210100.WWV_FLOW_MAIL", line 1031