error message from running umbrella_integration with -c flag for

convergence analysis

convergenceError.log

+imb15-010601-lt:umbrella_integration e.deplazes$  python umbrella_integration.py -i test_data/protein_system/protein_system_merged_ui_input.dat -n 50 -m 3.2 6.9 -r left -o test_data/protein_system/pmfUI.dat -p -w test_data/protein_system/derivatives.dat  -c
+['test_data/protein_system/protein_system_merged_ui_input.dat']
+25-10-2016 08:31:23: reading: test_data/protein_system/protein_system_merged_ui_input.dat
+25-10-2016 08:31:30: Distance between umbrellas 0.1 nm is within the recommended cutoff of 3/sqrt(BETA*K_fc) = 0.211 nm: Johannes Kastner and Walter Thiel 2006 (DOI: 10.1063/1.2206775)
+25-10-2016 08:31:30: Foce constant was: 500 kJ mol-1 nm-2
+25-10-2016 08:31:30: Umbrella equilibrium points used: 3.55 - 3.45
+25-10-2016 08:31:30: Distance between umbrellas 0.2 nm is within the recommended cutoff of 3/sqrt(BETA*K_fc) = 0.211 nm: Johannes Kastner and Walter Thiel 2006 (DOI: 10.1063/1.2206775)
+25-10-2016 08:31:30: Foce constant was: 500 kJ mol-1 nm-2
+25-10-2016 08:31:30: Umbrella equilibrium points used: 5.25 - 5.05
+Traceback (most recent call last):
+  File "umbrella_integration.py", line 664, in <module>
+    derivatives_file=derivatives_file)
+  File "umbrella_integration.py", line 169, in main
+    convergence_results = run_convergence_analysis(input_data, output_dir, CACHE_CONVERGENCE_ANALYSIS.format(path_id=cache_path))
+  File "umbrella_integration.py", line 398, in run_convergence_analysis
+    mu, sigma, convergence_robustness, truncation_index, block_size_index = convergence_analysis(timeScale="ps", xs=window_data["time"], ys=window_data["com"], log=logging, fig=fig)
+  File "../convergence_analysis/runAnalysis.py", line 29, in run
+    mu, errEst, convBlkSize = blkAvErrorEst(feData.time[:], feData.dvdl[:], log=log, fig=fig)
+  File "../convergence_analysis/samplingConv.py", line 28, in blkAvErrorEst
+    sizes, stds, ns = blkAvs(time, dvdl)
+  File "../convergence_analysis/samplingConv.py", line 173, in blkAvs
+    dvdlBlks = getBlocks(dvdl, blkSizeIndex)
+  File "../convergence_analysis/genLibMData.py", line 116, in getBlocks
+    blockBoundaries = range(0, len(y)+1, blockIndexSize)
+ValueError: range() step argument must not be zero