Mutation IDs do not get loaded

[RadkaP]

Please has anyone encountered following error and knows perhaps a hint how to fix it?

I have constructed the input table exactly according to instructions, in python/pandas, all column names match. For simplicity, I replaced my mutations IDs with simple code as the samples(R1....), that is M1.....All pairs of sample IDs and mutations ID are unique, I have checked that.

And I keep getting this error - the mutations do not get loaded.

Samples: R1 R10 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R11 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R12 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R13 R130 R132 R133 R134 R135 R136 R137 R138 R139 R14 R140 R141 R142 R143 R144 R145 R146 R147 R148 R149 R15 R150 R151 R152 R16 R17 R18 R19 R2 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R3 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R4 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R5 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R6 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R7 R70 R71 R72 R73 R74 R75 R76 R77 R78 R79 R8 R80 R81 R82 R83 R84 R85 R86 R87 R88 R89 R9 R90 R91 R92 R93 R94 R95 R96 R97 R98 R99
Num mutations: 0

BOTH mutation_id and sample_id have in the csv table type 'object' and I was not able though trying multiple approaches change it to type 'string'. But obviously, at sample_id is this not a problem
mutation_id object
sample_id object

The example file runs smoothly.

Thanks,

Radka