transmission

#1
i returned home after a month long trip turned into my drive way and the transmission on my 93 imperial went to first gear and locked
the dash said do not shift and the shift control had 1 od the two windows light with the number one the other window was blank
i disconnnected the battery and reconnected it the controler was back to normal and the motor would start
i drove it about 50ft and stopped to back in beside the garage and it locked again please help thanks in adavance
dave
 
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