When did it occur:
1. While placing a Clusterio Fluid Transmitter (Fluid Tank) directly onto a offshore pump
2. While placing a Clusterio Fluid Transmitter (Fluid Tank) directly onto a circuit locked pump (disabled status)
Error Screenshot:

While this is modded, the response from the creator of clusterio reported that this happens since 0.17.6 due to change in factorio
Waiting for a response from Dev's