gr-LTE freq sync and constellation plot

I have captured IQ samples using USRP N210 and saved it as .dat file but
when i gave it as input to gr-lte its not decoding.It shows like

sync_ffofrac_lte_sync_frequency_c_0 ASYNC! new offset = 3426 old
offset = 3423 samp_num = 7019
ofdm_lte_remove_cp_cvc_0 OUT of sync!
How to get constellation plot after layer mapping in PBCH decode?
Thank You,

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