When computing a model, using the Explicit solver, the following error is generated:
ERROR 173: Time Series (element label)_Inflow_Ts has its data out of sequence.
First, make sure you are using the latest version of the software. The link has details on downloading the latest version: Downloading OpenFlows | Hydraulics and Hydrology software.
If that doesn't help, review any patterns you are using, including for sanitary and wet weather inflows. For instance, if a pattern begins with hour zero, similar to the screenshot below, this error message will be valid. Note that if a starting multiplier for the pattern is entered, also including a row for hour zero may be inaccurate. In addition, make sure the last item in the pattern matches the starting multiplier.
Troubleshooting unstable SewerGEMS and CivilStorm model results using the Explicit SWMM Solver