when I use the code below I get this errors:
raise RDError(-1, except_msg)
refinitiv.data._errors.RDError: Error code -1 | Unable to resolve all requested identifiers in ['SCREEN(U(IN(DEALS)/*UNV:DEALSMNA*/), BETWEEN(TR.MnAAnnDate,20200101,20200108)/*dt:Date*/, CURN=USD)'].
#start_date
start_date="20200101"
#end_date
end_date="20200108"
#universe
universe=f'SCREEN(U(IN(DEALS)/*UNV:DEALSMNA*/), BETWEEN(TR.MnAAnnDate,{start_date},{end_date})/*dt:Date*/, CURN=USD)'
#fields
fields=["TR.COMMONNAME"]
#rd.get_data
df_i=rd.get_data(
universe=universe,
fields=fields,
#parameters=None,
#use_field_names_in_headers=None,
)
#print
print(df_i)
#close_session
rd.close_session()
print("done")