[4] Cannot open index configure file!

Sptag index build and search works good , Spann index build also works good , but I am facing a problem in the search part of SPANN

This is my SPANN index folder

Index build :
!/content/SPTAG/Release/indexbuilder -c /content/buildconfig.ini -d 784 -v UInt8 -f TXT -i /content/datadata.txt -o /content/spannindex784 -a SPANN

Spann index search

!/content/SPTAG/Release/indexsearcher -x /content/spannindex784/ -d 784 -v UInt8 -f TXT -i /content/dataquery.txt -o /content/outputSearch.txt -k 20

It starts up good but it stops with Cannot open index configure file!, I have not made any changes to the spann index folder , after building index , I provided the same path as it is ,

below are logs when I call spann search . PS:i am using the fashion mnist 784 Euclid dataset

[1] Using AVX2 InstructionSet!
[1] Setting DeletedIDs with value DeletedIDs.bin
[1] Setting DeleteHeadVectors with value false
[1] Setting Dim with value 784
[1] Setting DistCalcMethod with value L2
[1] Setting GenerateTruth with value false
[1] Setting HeadIndexFolder with value HeadIndex
[1] Setting HeadVectorIDs with value SPTAGHeadVectorIDs.bin
[1] Setting HeadVectors with value SPTAGHeadVectors.bin
[1] Setting IndexAlgoType with value BKT
[1] Setting IndexDirectory with value /content/spannindex784
[1] Setting QuantizerFilePath with value quantizer.bin
[1] Setting QueryDelimiter with value |
[1] Setting QueryPath with value /content/dataquery.txt
[1] Setting QuerySize with value -1
[1] Setting QueryType with value DEFAULT
[1] Setting SSDIndex with value SPTAGFullList.bin
[1] Setting SSDIndexFileNum with value 1
[1] Setting TruthPath with value public_query_gt100.bin
[1] Setting TruthType with value DEFAULT
[1] Setting ValueType with value UInt8
[1] Setting VectorDelimiter with value |
[1] Setting VectorPath with value /content/datadata.txt
[1] Setting VectorSize with value 60000
[1] Setting VectorType with value DEFAULT
[1] Setting WarmupDelimiter with value |
[1] Setting WarmupPath with value query.public.10K.u8bin
[1] Setting WarmupSize with value -1
[1] Setting WarmupType with value DEFAULT
[1] Setting AnalyzeOnly with value false
[1] Setting BKTKmeansK with value 32
[1] Setting BKTLambdaFactor with value -1.000000
[1] Setting BKTLeafSize with value 8
[1] Setting CalcStd with value false
[1] Setting Count with value 0
[1] Setting DataBlockSize with value 1048576
[1] Setting DataCapacity with value 2147483647
[1] Setting isExecute with value true
[1] Setting NoOutput with value false
[1] Setting NumberOfThreads with value 45
[1] Setting PrintSizeCount with value true
[1] Setting Ratio with value 0.120000
[1] Setting RecursiveCheckSmallCluster with value true
[1] Setting SamplesNumber with value 1000
[1] Setting SaveBKT with value false
[1] Setting SelectDynamically with value true
[1] Setting SelectHeadType with value BKT
[1] Setting SelectThreshold with value 10
[1] Setting SplitFactor with value 6
[1] Setting SplitMaxTry with value 8
[1] Setting SplitThreshold with value 25
[1] Setting TreeNumber with value 1
[1] Setting AddCEF with value 500
[1] Setting AddCountForRebuild with value 1000
[1] Setting BKTKmeansK with value 32
[1] Setting BKTLambdaFactor with value 100.000000
[1] Setting BKTLeafSize with value 8
[1] Setting BKTNumber with value 1
[1] Setting CEF with value 1000
[1] Setting DataBlockSize with value 1048576
[1] Setting DataCapacity with value 2147483647
[1] Setting DeletePercentageForRefine with value 0.400000
[1] Setting DeleteVectorFilePath with value deletes.bin
[1] Setting DistCalcMethod with value L2
[1] Setting EnableBfs with value 0
[1] Setting EnableRebuild with value 0
[1] Setting GPUGraphType with value 2
[1] Setting GPULeafSize with value 500
[1] Setting GPURefineDepth with value 30
[1] Setting GPURefineSteps with value 0
[1] Setting GraphCEFScale with value 2.000000
[1] Setting GraphFilePath with value graph.bin
[1] Setting GraphNeighborhoodScale with value 2.000000
[1] Setting HashTableExponent with value 2
[1] Setting HeadNumGPUs with value 1
[1] Setting isExecute with value true
[1] Setting MaxCheck with value 16324
[1] Setting MaxCheckForRefineGraph with value 16324
[1] Setting MetaRecordSize with value 10
[1] Setting NeighborhoodSize with value 32
[1] Setting NumberOfInitialDynamicPivots with value 50
[1] Setting NumberOfOtherDynamicPivots with value 4
[1] Setting NumberOfThreads with value 45
[1] Setting NumTopDimensionTpTreeSplit with value 5
[1] Setting RefineIterations with value 3
[1] Setting RNGFactor with value 1.000000
[1] Setting Samples with value 1000
[1] Setting ThresholdOfNumberOfContinuousNoBetterPropagation with value 3
[1] Setting TPTBalanceFactor with value 2
[1] Setting TPTLeafSize with value 2000
[1] Setting TPTNumber with value 32
[1] Setting TreeFilePath with value tree.bin
[1] Setting VectorFilePath with value vectors.bin
[1] Setting Batches with value 1
[1] Setting BuildSsdIndex with value true
[1] Setting DebugBuildInternalResultNum with value 64
[1] Setting EnableADC with value false
[1] Setting GPUSSDLeafSize with value 200
[1] Setting GPUSSDNumTrees with value 100
[1] Setting HashTableExponent with value 2
[1] Setting InternalResultNum with value 64
[1] Setting IOThreadsPerHandler with value 4
[1] Setting isExecute with value true
[1] Setting LogFile with value 
[1] Setting MaxCheck with value 16324
[1] Setting MaxDistRatio with value 8.000000
[1] Setting NumberOfThreads with value 45
[1] Setting NumGPUs with value 1
[1] Setting OutputEmptyReplicaID with value false
[1] Setting PostingPageLimit with value 3
[1] Setting QpsLimit with value 0
[1] Setting QueryCountLimit with value 2147483647
[1] Setting RecallAnalysis with value false
[1] Setting RecallTestSampleNumber with value 100
[1] Setting ReplicaCount with value 8
[1] Setting Rerank with value 0
[1] Setting ResultNum with value 10
[1] Setting RNGFactor with value 1.000000
[1] Setting SearchInternalResultNum with value 32
[1] Setting SearchPostingPageLimit with value 3
[1] Setting SearchResult with value result.txt
[1] Setting TmpDir with value /content/tempfolder
[1] Setting TruthResultNum with value -1
[1] Load Vector (7333,784) Finish!
[1] Load BKT (1,7335) Finish!
[1] Load RNG (7333,32) Finish!
[1] Load DeleteID (7333,1) Finish!
[1] Setting NumberOfThreads with value 45
[1] Setting MaxCheck with value 16324
[1] Setting HashTableExponent with value 2
[1] Finish reading header info, list count 7333, total doc count 60000, dimension 784, list page offset 22.
[1] Big page (>4K): list count 6694, total element count 96954.
[1] Total Element Count: 98081
[1] Page Count Dist: 0 252
[1] Page Count Dist: 1 387
[1] Page Count Dist: 2 369
[1] Page Count Dist: 3 6325
[1] Load MetaIndex(0) Meta(28222)
[4] Error: Failed to load metadata.
[4] Cannot open index configure file!

[4] Cannot open index configure file! , I did not modify any file in the spann index folder yet this error , Please help

Reproduce the failure with the shown indexbuilder and indexsearcher commands using the SPANN Fashion-MNIST setup. Inspect the generated /content/spannindex784 folder alongside the search log, especially the metadata-loading step and the missing index configuration message. Done means determining why the built index cannot be opened for search and documenting a verified resolution.