[WORKAROUND] Unable to create string as not enough memory (FlashEEPROM problem)

Hi,

I have a relatively big codebase right now and I'm not sure what causes this error:

Unable to create string as not enough memory

I guess I'm having trouble while reading from FlashEEPROM with the following class:

export pack = (x) ->
    JSON.stringify x

export unpack = (wire-data) ->
    try
        x = JSON.parse wire-data
        throw if x is void
        return x
    catch
        console.log "Error on unpacking: ", e
        console.log "wire data: ", wire-data
        throw "Error on unpacking"

export !function Config file-no
    self = this
    @file-no = file-no
    @f = new (require "FlashEEPROM")(0x076000)
    @f.endAddr = @f.addr + 1024
    @write-count = 0

    @write = (data) !->
        if @write-count++ > 10
            @f.cleanup!
            @write-count = 0
        @f.write self.file-no, pack data

    @read = ->
        try
            data = E.to-string @f.read self.file-no
            return unpack data
        catch
            console.log "ERROR CONFIG READ: ", e
            console.log "raw data read: ", data
            console.log "dump: ", @file-no

Here is the Javascript output of above code:

var pack, unpack, out$ = typeof exports != 'undefined' && exports || this;
out$.pack = pack = function(x){
  return JSON.stringify(x);
};
out$.unpack = unpack = function(wireData){
  var x, e;
  try {
    x = JSON.parse(wireData);
    if (x === void 8) {
      throw null;
    }
    return x;
  } catch (e$) {
    e = e$;
    console.log("Error on unpacking: ", e);
    console.log("wire data: ", wireData);
    throw "Error on unpacking";
  }
};
out$.Config = Config;
function Config(fileNo){
  var self;
  self = this;
  this.fileNo = fileNo;
  this.f = new (require("FlashEEPROM"))(0x076000);
  this.f.endAddr = this.f.addr + 1024;
  this.writeCount = 0;
  this.write = function(data){
    if (this.writeCount++ > 10) {
      this.f.cleanup();
      this.writeCount = 0;
    }
    this.f.write(self.fileNo, pack(data));
  };
  this.read = function(){
    var data, e;
    try {
      data = E.toString(this.f.read(self.fileNo));
      return unpack(data);
    } catch (e$) {
      e = e$;
      console.log("ERROR CONFIG READ: ", e);
      console.log("raw data read: ", data);
      return console.log("dump: ", this.fileNo);
    }
  };
}

I'm trying to use this code as follows:

a = new Config 1

inc-input = ->
    try
        x = a.read!
        throw if isNaN x
    catch
        console.log "error reading input counter: ", e
        x = 0
    a.write ++x
    x

sim2 = !->
    <- :lo(op) ->
        console.log inc-input!
        <- sleep 5ms
        lo(op)

...the Javascript:

var a, incInput, sim2;
a = new Config(1);
incInput = function(){
  var x, e;
  try {
    x = a.read();
    if (isNaN(x)) {
      throw null;
    }
  } catch (e$) {
    e = e$;
    console.log("error reading input counter: ", e);
    x = 0;
  }
  a.write(++x);
  return x;
};
sim2 = function(){
  (function lo(op){
    console.log(incInput());
    return sleep(5, function(){
      return lo(op);
    });
  })(function(){});
};

The error is:

Error on unpacking:  null
wire data:  undefined
ERROR CONFIG READ:  Error on unpacking
raw data read:  undefined
dump:  1
144
145
146
147
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Error processing Serial data handler - removing it.
Execution Interrupted during event processing.
at line 1 col 148
....flash.read(a,r.addr+4),h==e))){if(r.end+e.length+4>=this.en...
                              ^
in function "write" called from line 1 col 89
...is.f.write(n.fileNo,pack(e))
                   in function "write" called from line 1 col 81
...g.read(),t.set),cfg.write(o),inpCounter.write(o.coinInpRx),o...
                              ^
in function called from system
148
149
150
151
152

I expect the sim2() function to increment flash memory area by 1 in every 50 ms and this is what happens most of the time. But sometimes, (in a random order of power cycles) it Config.read() throws an error and memory can not be read.

Is there anything I might misunderstand about usage of FlashEEPROM?